fack

Synonymous with the word 'fuck.' Notably used in cases where the writer does not know (American) English well and in attempt to sound out the word while applying his known letter/pronunciation set results in a slightly mangled but understandable version of the word.

Example at engrish.com, where some silly Japanese bastard decided to spraypaint profanities on the wall yet failed in his (American) English spelling:
Fack You Man

(alternately pronounced as 'fack', similar to the word 'fact', to those who find such objects of Japanese word scrambling humorous and to explicitly specify that you are not saying the word 'fuck', but rather the word 'fack')

by Stimar May 7, 2003

mutha facko

term used commonly by juggalos, juggalettes, ICP, etc. same as mother fucker

Man, that mutha facko wont share the faygo!

by tweemo April 20, 2003

Facktard

Someone completely obscessed with Eminem's hit single "Fack"

"You just made that word up, you're probably a closet facktard."

by freakball February 14, 2009

Facko

Fucker. Fuck Head, Fuck Face, Fuck

What's up Motha "Facko"

by Double AA September 17, 2003

Fack Oof

The scottish pronuciation of 'Will you please kindly leave'

Tourist: Hello, do you mind telling me where I am?

Scottish man: Noo, ya can Fack oof!

by Grbel08 April 21, 2010

facky

Over use of facts to try and make a point.

I got tired of listening to his facky explaination of why Rush Limbaugh should stay on the air.

by Larry Ray Richardson October 7, 2003

FACK

The FACK algorithm is based on first principles of congestion control and is designed to be used with the proposed TCP SACK options. By decoupling congestion control from other algorithms such as data recovery, it attains more precise control over the data flow in the network.

"FACK my network, please"

by Serafim February 9, 2007