When your Dominant puts you so deep into subspace that all you can think about is the unyielding, intense desire to be fucked.
I love when my man puts his hands on me. He gives me such slut brain whenever I am around him!
by Vorsteher Agony May 8, 2021
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The ability to shut or block off the part of the psyche that is responsible for developing emotional intimacy and connection during sex, rendering intercourse a pointless pleasuring event with no real "magic".
You don't need to actually like someone to sleep with them, it's all about physical gratification when ya got slut-brain.
by Tam O February 20, 2016
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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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Someone who volunteers for research studies that mess with their brains (usually via psychoactive drugs) for some cash.
Danny signed up for 3 drug studies last week because he was broke, and went bat shit crazy...what a brain slut.
by clasw74 August 3, 2009
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