An acronym for "I Am So F-ing Sorry", a sarcastic apology, typically issued in a chat room, forum, or text message communication.
AirEck: Hey guys, check out this funny YouTube video (link).
Deepek: Repost, loser!
AirEck: IASFS, Deepek
4👍 1👎
e.g person1: we have a test 2morrow, u revised
Person2: no iasf!!!