Swacked is the term Pauly D of Jersey Shore uses to describe if ones 'swag' has been jacked, the other male room mates also know what 'swacking' is, showing us that swacking has presence within guido group of friends, possibly its origin. To be jacked is another meaning to be robbed, and swag is how one presents themselves, so basically saying he/she is a 'copycat' as it were, copying your swag, your quotes, style, attitude, personality, anything they find funny or cool or impressive to others might get swacked. In a nutshell swacking is when one is trying to be you, or as stated above, copy you - many celebs are swacked whether intentionally or not.

Set the trend, don't follow.
Pauly D: "YEAH BUDDY, WAKE UP YEAH!" Pauly says this very loudly, shaking everyones bed and jumping on them, having banter which everyone enjoys, its one of his many trademark quotes.
Ronnie: “YEAH BUDDY, WAKE UP YEAH!" mimicking Pauly but very poorly, and not amusing but more cringey.
Mike "The Situation": "Yo Pauly bro, you just got Swacked!"
Pauly D: "I know dawg, for real.. Just keep it original"
by TaylorGangOrDie11111111 January 13, 2012
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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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It means to steal. More specifically it means to steal something that others covet or gives one maximum pleaure. Examples: Ladies, beer, money, drugs etc... Derived from swindle, snag, hack.
Chu betta swack that shit mutha fucka! Aye' lemme swack a brewski.
by Triple Triple C-Naj August 29, 2008
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