1. Quite literally, to fuck in the skull. This usually means inserting one's penis into any orifice in the head (excluding the mouth), such as the nostrils, ears or a hole bashed into the back of the head with a pair of pliers. As this is not only rather painful but quite impossible in most cases, skullfucking is not a common practice in real life (unless you're talking about necrophiliacs that is). It is, however, tolerably prevalent in the world of hentai art, resulting in pictures that are more horrific than sexually arousing. My advice: don't seek out any of these pictures unless you have an uncontrollable urge to lose your lunch all over the keyboard. See also skullfuck.
2. See mindfuck.
3. Can also be used as a kind of insult.
1. I love skullfucking ^_^
2. Damn, watching Memento will give you a bloody good skullfucking.
None of the below definitions have it right.
Skullfucking has only ONE literal meaning, which is to fuck a person's eyesocket.
It does NOT refer to fucking them in the mouth, throat, ear, makeshift hole, or anywhere else.
"Can you skullfuck me?"
"You know skullfucking means to fuck your eyesocket, right?"
"It does? Nevermind then."
To hold the recipient by the back of the head and insert one's penis into another's mouth forcefully and deeply. Most likely giving the skullfuck-ee less enjoyment than the skullfuck-er.
Skullfucking is fun until someone loses an eye...
the actof forcing ones penis down a willing females throat , often leading to severe gagging but obvious enjoyment on the part of the female participant
"I skullfucked her till her spit ran down my balls"