Knows the secret of something
If I'm planning to throw a suprise party for one of my friend's birthday. He is the only one who's NOT in on the joke about the party.
(Special thanks to one of my Canadian friend)
(Special thanks to one of my Canadian friend)
by Gunhyoung August 18, 2006
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in on the joke • Got in on the ground floor • bosh it in on the fly • tension on the in • Making 4 definitions in a day on the urban dictionary because I had nothing better to do • Hand in the scene - not on the screen • Two in the palm—one on the schlong • on the tarmac in Charlotte • pee IN the toliet, not ON the toliet! • Two on the broom, one in the room