This is a nickname that uses reverse psychology on the classic word "Slacker" -as in to be lazy.
"Slack" is the most AWESOME word you can use to describe a person and has been developed to change expectation by subterfuge.
Dude! You are soooo Slack!!!!!!!!
by James Russell November 23, 2004

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verb
1. To cut someone some slack by providing something they would like.

2. Commonly used to ask someone to fetch something.

3. To loosen tight contol of an asset, whether money, food, drink, or miscellaneous items, and in doing so, allow another to have use of said item. Often, a request to slack something implies asking another to give/lend it, while simultaneously asking them to fetch it for you.
"Slack me that screwdriver over there, can you? I don't want to let go of this right now." "My fridge is empty...whyncha run to your house and slack us some beers?" "Slack me a Benjy for happy-hour tonight...I'll hit ya back tomorrow."
by James O. February 23, 2006

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An adjective much like chill, showing approval, contentment, or mild amusement.
Friday night was slack.
Oh man, that shot was slack!
by Fuck you October 26, 2004

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gimme some space, dont nag etc

adult meanings: slacking, not working/ being active etc
teenage mother: what ya doing with that in the house, setting bad examples for little timmy here!
teenage father: gimme some slack lauren, its not that illegal
Timy: me want dope
by girl_next_door October 15, 2004

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noun

A pair of full length pants, or trousers.
Nice pair of slacks you're wearing today.
by nurofinn August 15, 2007

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- the dated word your mother-in-law would use instead of "pants"
He has a lovely pair of slacks on.

(yeeeesh!)
by Doctor Livingstone May 14, 2005

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A preferable way to describe trousers, pantaloons, dress pants, etc.
Yo, that chick was digging my slacks!
by superdawg90 June 14, 2011

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