to have sex with (someone) energetically
If Paris Hilton was my girlfriend, I'd fuck her brains out.
by Atheer May 9, 2007
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When a man fucks a woman so good she orgasms multiple times, trembles/shakes uncontrollably, is unable to speak properly and needs to sleep afterwords to recover.
Ted: Fucked me girlfriend last night good and proper, she couldn't speak properly afterwords.

Bob: Thats because you fucked her brains out man.

Ted: Fucking right i did!
by Retro-Cat February 29, 2016
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when a man fucked a women so hard she had multiple orgasms and shakes her legs while she cant control it and also takes a fat ass nap afterwards.
Trey: "fucked her brains out "
Kevin: " damn she shaking?"
Trey: " hell yea"
Kevin: "my boi"
by Jaedyn <3 March 30, 2022
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The act of shooting someone in the head with a large caliber round and proceeding to have sex with the bullet hole.
1 "Dude, I'm totally gonna fuck her brains out tonight."

2 "No man that's not cool, that's fucked up."

1 "You mean it will be."
by Jdhdiehdudbdunsd July 23, 2013
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