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1.
when a female has a nice ass shes got lots of junk in her trunk
damn that bitch got junk in her trunk!
by ashlee June 16, 2004
 
2.
to put ones junk (penis) into another persons trunk (ass)
Male 1: Dude, i totally wanted to do her in the ass, but she said she didnt want my junk in her trunk.

Male 2: That sucks man.
by Cathouse3 October 26, 2009