Top Definition
a japanese cookie that when eaten, gives you gas and heartburn.
Daniel: hey martin wanna try these new japanese cookies?

Martin: OOOO i want cookie!!!

next day

Martin: Dude, that joompu gave me serious gas. and i dont know if it was the cookie, but i got a nasty heartburn.
by pietrzak February 01, 2007
4 Words related to joompu

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