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A slang way to say "penis envy" by a man for another man's (supposedly) much larger junk.
"Joe is humongous downstairs, if you know what I mean."

"Dude, get over it. You're just junk jealous."

by al-in-chgo March 12, 2010
Being jealous of another mans' junk.
When Bill saw Mike's huge package, He was Junk Jealous.
by DJ_Schmidty October 31, 2009