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1.
Used in spoken word in lieu of a noun when it can not be thought of at speed.

Synonyms:Yoke, thingy, shit etc.
I went to jembo on my jembo today, in the process forgetting my jembo, so I was forced to use a jembo instead.
by ShoobyT August 13, 2006
 
2.
Noun: a pal/not super close freind of yours thats loopy, crazy, and/or drunk.
My jembo Angie is on a major rampage and is running around wild!
by elmaster64 January 07, 2008