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Swack is basically another word for fuck. This word originated in San Diego, where lots of guys use it.
GUY 1: Look at that ass over there, would you SWACK?
GUY 2: I'd mos def SWACK that.
by Matt December 28, 2004
Usually means sex. Originally made in San Diego, niggas who like to use the word towards females.
Him- Yoo when we gonna swack baby ?
by SpokenThuq May 08, 2006
the act of jacking someones swag, aka swagger jacking
stop swacking me bro
by Vinny del Negro September 28, 2011
1.) To bang the sh!t out of

2.) To copy of someone's swag
1.) Imma swack you all night, baby.

2.) Bobby likes to swack on Jay pretty much every day of his life. He even has the same shoes and repeats the same jokes to girls when he's drunk.
by $moak$takk November 11, 2011
A black person from the country of Sweden.
"I cant believe that hit Johnny Oduya laid on that guy last night"
"Yea that swack can really lay the body"

"A black Swedish guy you say, I gotta see this"
"I know right? The swack is standing right over there"
by tml 4 life December 19, 2013
1. sweaty sack

2. scrotal sweat
Billy walked into the locker room and said, "gross. It smells like swack in here."
by G. Secks May 29, 2012
to smack someone with something
she got swacked in the face
by shaynabobana April 21, 2011