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1.
Great. Having great qualities. Usually attributed to items of financial worth (i.e., cars, homes....).
"That new Cadillac is lookin' Sick Wid It, man!"
by Magmeezie August 27, 2003
 
2.
1. something that is tight.
2. going along.
1. this bowl is sickwidit.
2. are you going to the bar tonight? yea man, i am sickwidit.
by j March 10, 2005