Swack is a slang term for is wack, or is crazy. The proper way to type it would be 'swack.
That idea 'swack
by Drennin May 1, 2004
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An odor which resembles that of a sweaty ass crack.
After my girlfriend and I had sexual relations, I left the room to get some kool-aid. Upon returning to the bedroom I noticed the fragrance of SWACK in the air.
by A-dizzle Martin-ez March 24, 2008
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originated from wack an swat ... can mean something is really cool or totally horrible
Ashley:"Dude on i got a really good deal on these soes i'm gonna look so hot tonight."

Jenn: "Thats total swack"
by Jenn is not impressed April 18, 2008
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adjective to describe something that doesn't make sense or is random

so pretty much anything that Ben says.....
A: There's a person on the roof
B: That's swack!
by Jeff Twinkles August 12, 2019
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meaning swish or a made shot when ur on the basketball court/ refering to the motion of the net on the rim
watch this swack when i swish my three pointer
by OgChris94 February 7, 2008
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Swack is ball sweat. Swack is the act of sweating under your ballsack area. Swack usually smells terrible and is not something that you would want to brag about in front of females. Occasionally it is funny to rub your hand on your swacking area then shove it in another friend's nose.
I am majorly swakin' right now.
My swack is puddling up under my balls.
by Bruce Jigaweed June 19, 2008
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