Someone you fancy (or love), who knows you do, and just strings you along and fucks with your head.

A difficult or awkward situation with no obvious correct course of action, literally something which fucks with you head.

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.

A concept that you can't get your head around so you just sit there and do the verbal & mental equivalent of "?".

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".

A headfuck is a person who spends all hours toying with peoples minds.

This is usually done in practical joke form.

The act of fucking someone's head or a blowjob in which the man thrusts his penis in the woman's mouth in an act of fucking her head.