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1.
(sarcastic tone) means "yeahhhh right" etc.. if someone sounds like they are talking bullshit, you say "jacc"
Person 1: "Last night I got laid by 200 different supermodels"

Person 2: "Jacc"
by tripmonk October 29, 2003
15 7
 
2.
A person who is acting like an idiot, short for jackass.
Why are you being such a jacc?
by douglasfudges jr February 10, 2009
5 3