Top Definition
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)
#secret #plan #figure out #jokes #on a joke
dari Gunhyoung Kamis, 17 Agustus 2006
5 Words related to in on the joke
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