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(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
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3
The term referring to having multiple orgasms and ejaculating only once.
“ I had a Jacc yesterday.”
by Xiiyya December 21, 2017
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