AF
Abbreviation with 5 meanings
| Stands for | As f*** |
|---|---|
| Meanings | 5 |
| Categories | Texting & Internet Slang, Transportation & Travel, Medical, Geography & Places |
AF has five meanings. The most common are As f*** (Gen Z slang) and Air France (airline code); it can also stand for Atrial fibrillation, Afghanistan and Aunt Flo (menstrual period).
Meanings of AF at a glance
| # | AF stands for | Context |
|---|---|---|
| 1 | As f*** | Texting & Internet Slang › Gen Z Slang |
| 2 | Air France | Transportation & Travel › Airline Code |
| 3 | Atrial fibrillation | Medical › Cardiology |
| 4 | Afghanistan | Geography & Places › Country Code |
| 5 | Aunt Flo (menstrual period) | Texting & Internet Slang › Parenting Forum |
1. As f***
Texting & Internet Slang · Gen Z Slang Abbreviations
Intensifier placed after an adjective, as in "tired af" or "cute af," meaning "extremely." One of the most common slang abbreviations on social media.
Example: This coffee shop is cozy af, I could stay here all day.
Spread widely in the early 2010s on Twitter and Tumblr and is now common across ages. Variants include "asf." Contains strong profanity in its full form, so avoid it in professional or school contexts. In aviation and the military, AF can mean Air Force, which context makes clear.
2. Air France
Transportation & Travel · Airline Code Abbreviations
French flag carrier based at Paris Charles de Gaulle, and a founding member of the SkyTeam alliance. It merged with KLM in 2004 to form the Air France-KLM group.
Example: Air France AF 11 departs CDG for New York, with a connection to Montreal on AF 344.
ICAO code AFR; radio callsign "Airfrans." Founded in 1933 by merging several French airlines. It operated Concorde with British Airways until 2003; Air France Flight 4590 crashed in July 2000 at Paris. The loss of Flight 447 over the Atlantic in 2009 led to industry-wide changes in pilot training for high-altitude stalls.
3. Atrial fibrillation
Medical · Cardiology Abbreviations
Chaotic electrical activity in the upper chambers that makes the heartbeat irregularly irregular, the most common sustained arrhythmia in adults. It raises stroke risk about fivefold because blood pools in the left atrial appendage and can clot, so anticoagulation decisions use the CHA2DS2-VASc score.
Example: ECG: AF with ventricular rate 132, no ST changes; diltiazem started for rate control.
AF is the form preferred in guidelines and journals, while "AFib" or "A-fib" dominates in patient materials and speech. Episodes are classified as paroxysmal (ending within 7 days), persistent, long-standing persistent (over 12 months) or permanent, and the 2023 ACC/AHA/ACCP/HRS guideline added stages from "at risk" to permanent. In other contexts AF can mean Air Force or autofocus.
4. Afghanistan
Geography & Places · Country Code Abbreviations
Afghanistan's two-letter code appears on the .af domain and in AFN, the currency code for the afghani; the alpha-3 code is AFG. The landlocked country, with Kabul as its capital, borders six countries, including China through the narrow Wakhan Corridor.
Example: The visa form lists AF as the country of birth.
AF is also the ISO 639-1 code for the Afrikaans language, unrelated to Afghanistan, so locale tags such as af-ZA mean Afrikaans in South Africa. AF also abbreviates Air Force and atrial fibrillation.
5. Aunt Flo (menstrual period)
Texting & Internet Slang · Parenting Forum Abbreviations
Euphemism for a menstrual period on fertility and women's health forums, as in "AF arrived" or "AF is late." Used especially by people trying to conceive, for whom it signals a cycle without pregnancy.
Example: AF showed up right on time, so on to the next cycle.
"Aunt Flo" is a long-standing playful euphemism for periods, and TTC forums shortened it to AF. Members track "AF due dates" in apps. On social media, af usually means "as f***," a completely different sense.
Related abbreviations
More Gen Z slang abbreviations
- 67 – Six seven (Gen Alpha meme)
- ATP – At this point
- BFFR – Be f***ing for real
- BSF – Best friend
- Delulu – Delusional
- DTI – Dress to Impress
- FAFO – F*** around and find out
- Fam – Family
See all 47 Gen Z slang abbreviations →
More airline code abbreviations
- 6E – IndiGo
- AA – American Airlines
- AC – Air Canada
- AI – Air India
- AM – Aeroméxico
- AS – Alaska Airlines
- AV – Avianca
- AY – Finnair
See all 60 airline code abbreviations →
This entry is for general education and is not medical advice. Abbreviation use varies between institutions; always confirm in context.