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the Fonz's version of "piss off" or "screw you" and countless other negatory response variations.
(really kinda racey for it's time)

i never really thought about what it literally meant when i was like 5 yrs old. but seeing the reruns now i'm like OMG WTF?!?!? does he really want everyone to sit on his... um, motorcycle? heheh.
Ralph asks if he can borrow Fonzie's leather coat to impress a chick. Fonzie then replies in jest
"Sit on it!"
<live studio audience laughs>
by e-fu December 19, 2003
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to hold for an extended period of time.
i'm going to up my prices on these shrooms and just sit on it, ill make my money in the long run.
by j-breez March 23, 2009
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Used as a phrase.

It means to sit somewhere and think about the idea you have or to shut up and think more about what you are going to say before you move on to what you're going to say.
Me: Hey Fonz can I get some..
Fonz: Sit on it Kami.
by Kamisama May 30, 2005
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1. What a teacher tells you to do when you excessively sharpen your pencil, blow your nose or go to the bathroom.

2. What you tell someone when they flip you off.
1. Kid: can I go to the bathroom real fast? I gotta take a leak!

Teacher: Sit on it and take the damn final!!

2. Guy 1: Take my girl huh? Right here ya fucker!

" Guy 1 flips off Guy 2 "

Guy 2: Ahh Sit On It!
by gk339 June 16, 2009
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Used in reference to sitting on something in a sexual manner. The phrase first came into being during an episode of "The Girls Next Door" when Hef's new twin girlfriends were doing a sexy tennis photo-shoot. Both were holding tennis racquets and the photographer asked them to do something different. One person who was watching the show shouted, "Sit on it!" in reference to the girls sitting on the tennis racquets in a sexual manner.
Photographer in show: Ok girls, now do something different with the tennis racquets.
Guy 1 (watching show): Ya, ya, sit on it!
Guy 2 & 3 (sitting next to Guy 1), stare at Guy 1 in utter amazement, disgust, and intrigue.
by soundwave February 28, 2009
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