Top definition
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

by Slowpoke330 January 27, 2008
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2
e.g person1: we have a test 2morrow, u revised

Person2: no iasf!!!
by Shanaza February 21, 2009
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