n. Slap on Forehead. Usually said (on MSN or any form of instant messaging online) when the other person has said something extremely stupid or "uncool". The letter equivalent of the now common =.=". Sof is used for those who are deprived of newer versions of MSN which allows them to send and receive custom emoticons.

A: oh my god, Jesse McCarteney is so hot.
B: sof. you're kidding, no he's not.

sof by eccentric.joker August 1, 2006

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SOF

An organization of ten homosexual boys originating from WMMHS who rally frequently to convey their extreme affection for one another and refer to themselves as "the society of friends."

Billy and his 9 friends are members of the SOF.

SOF by OOC September 1, 2008

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Sof

Stopper of fun

Them : stop doing that

You: you are such a sof

Sof by Lily the Great May 5, 2021

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sof

sof is sof

what is a sof

sof by cumcat April 27, 2021

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