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1.
You are so fucking adorable.

Typically used during texting or other messaging, and directed toward the girl/guy that you fancy.
W: Hey babe I just cannot get over how wonderful you are!
Tess: Omg! You are sooooo sweet! :)
W: yasfa!!
by Ducky8624 June 05, 2013
4 0
 
2.
An initialism for "you are so fucking (or freaking) awesome."
Hey Joe, thanks for remembering to bring me my $100, YASFA.
by kcsj1993 October 09, 2011
2 1