Top definition
Someone you fancy (or love), who knows you do, and just strings you along and fucks with your head.
Toadie mate, be careful, that girl is a headfuck
by Car-lie October 21, 2007
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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2
A difficult or awkward situation with no obvious correct course of action, literally something which fucks with you head.
"I slept with my girlfriend's identical twin sister without realizing and don't know whether to tell her or not, it's a complete headfuck"
by Henners17 May 06, 2008
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3
The feeling you get when an idea or concept is beyond your understanding. Also used to describe the idea or concept that causes head-fucking.
"You know that painting by Dali with the elephant with the giraffe legs? That gives me a serious head fuck, man."
by Mr Ben February 10, 2005
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4
A concept that you can't get your head around so you just sit there and do the verbal & mental equivalent of "?".
by w00t April 02, 2004
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5
Someone you fancy (or use to) who knows you do, and just strings you along and fucks with your head or texts you when your happy

Aka harry henderson
Mate that harrykid always texts me when I’m happy what a head fuck
by Hhhhhdawgy January 29, 2018
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6
1.Originally quoted from the movie "Beer Fest"...used by the german actor(Ralf Moeller) when the germans confronted the americans about the secret beer fromula.

2.It is a rearrangement from the word "fuckhead".
"How do you like that Head Fuck" - Ralf Moeller
by Neon Knight and Solid Snake April 07, 2007
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