Top definition
A penis that makes the "Fap" sound against the testicular sack when doing jumping jacks or just pelvic thrusting.
"What's that sound?"
"Oh, that's Brock."
"Damn! I didn't know he had a thunder schlong!"
by VaginaΒ² October 31, 2009
Get the mug
Get a Thunder Schlong mug for your cousin Sarah.