Top Definition
An insult used to call a person
who only knows how to be a slut
and lacks mental capabilities.

Can also be abbreviated as SFB.
KevBot: Wow, look at that SFB over there.
JenBot: Yeah she is definitely a Slut for Brains, she wouldn't know a rock from a squirrel.
KevBot: But she'd kiss it anyway.
by Superguard August 19, 2008

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