Jimmy-jumping 

Getting an erection while jumping on a trampoline.

"Dude look at that hot girl."
"Ha, you're going to to start jimmy-jumping!"

Jimmy-jumping by HeyItsThatSexyGuy July 11, 2012

jimmy jumping beans 

A guy that rushes a relationship by insisting on sex too quickly. (usually a narcissist)

She wanted to take things slow with her new boyfriend, but he ruined it by being a jimmy jumping beans.

jimmy jumping beans by Turtletracks November 11, 2014