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1.
Any Person bearing this moniker is likely to be one of the most interesting people you will ever meet. You never forget a Koob.
Guy 1: Did you hear that story Koob told?
Guy 2: Totally! I still don't believe he did that!
Guy 1: I didn't either, but then he showed me pictures.
Guy 2: What are the odds of finding 4 chicks who are THAT flexible, and THAT freaky, at ONE church function?
de Justin_Boober 12 janvier 2012
 
2.
Short for "kid boobs."
I wish I had DD's like Janelle, but I only have koobs.
de bonerboy 19 mars 2008
 
3.
"book" spelled backwards
Wanna koob it?
de Nicole 5 avril 2004