A prolonged way of saying "fuck" when you are busted in an awkward/uncomfortable situation.
Timmy: "Chaz shit his pants yesterday."

Shelly: "He's sitting right behind you..."

Timmy: "Fack..."
by Mere Scraps August 02, 2009
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A variation of fuck that you exclaim out loud in a questioning tone when something unfortunate, suprising, and/or stupid happens; a shortened "What the fuck ?!"
by G I N F U July 28, 2008
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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 07, 2007
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when some one gets mad and decices to call you a fucking fag. as if saying fag wasnt enough they also had to add fucking to it. but if you say it to fast it turns out to say FACK... lol :P
yo adrian what the hell were you thinking!!! are you a fack use you flippin brain!!!!
by mr.pebbles :P March 27, 2010
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