Like fuck but, you know, spelled wrong.

the whale tail is the shape formed when a g-string rides up high over a womans trousers

Fuck, but spelled without the c to avoid programs that bleep out typed curses... Also sometimes a simple typo.

The word "fuk" is commonly used when you can't type "Fuck" in a mmorpg game.

A misspelling of the word "Fuck".

One word that is edited by abbreviated hacker language It can, of course, be used in all the different grammatical forms, including:
Fuk:v. to fuck, adj. used in frustation
Fukin:adj. EX: i hate this fukin school
Fuked:v. to do someone, adj. despair
Fuker:n. someone that you really dislike

Abbreviation for IRC channel #fortress.uk (usually caps: "FUK")

A bastion of Britishness in the face of the joint assault of AOL lamers and "cheating euro cunt0rs".

(Full of work shy layabouts.)