When a jumbo jet gets struck by lightning while you are masturbating and the molecules in your penis are altered and your cock grows giant metal wings.
"wanna go to walmart?" "Sure, illtake my jumbo cock"
the word JUMBO JUNK is used to describe a males big penis or ballsack. junk is slang for a man's penis and ballsack area. jumbo is in the word to describe the largeness of the penis or ballsack.
my boyfriend named his dick jumbojunk because he is just so big.