serve and fuck off. Commonly used in Compulsory military training.
A: National service is such a waste of time.
B: That's right, so just SAF(serve and fuck off).
by wilson beard more July 11, 2008
SAF is short for Self Affirmative Fan

For whatever reason, this person feels that they are lesser, or below other fans (most often for the reason that they'd recently starting listening to the artist and or band.) So in an attempt to prove themselves as "real fans" they spend a majority of their time talking about the band/artist, making references to them, reading about them, etc...

Although SAFs have good intentions of only wanting to be considered "one of the group", their actions are often misinterpreted as a way to "show up" other fans and make them look unintelligent and uninformed about the subject band/artist.
Betty (SAF)- Did you know that insert band name here is going to be on TV tonight?

Charlie- Yeah...

Betty- Oh. Well did you know they're going to be singing insert song name here? I read about it on their website last night, along with a few articles about them.

Charlie- You know, you don't have to be such a SAF.
by That very last leaf today January 21, 2011

stupid ass fuck
When the person you are talking about is beyond stupid.

That damn Jim is one SAF!
by Felicia Laster July 3, 2007
Short way of sayin' 'Such a Faggot', often used in online gaming or chattin'.
OMG!! TH@ guy is SAF!
by Deathrow_Records February 24, 2005