Steam boat jimmy 

When boy and girl are in shower together.. girl has hot water in mouth.. boy sperms into mouth with water still in there.. let it float around.

Man, that chick last took my Steam boat jimmy hard

Steam boat jimmy by TedBrah October 27, 2009

Uncle Jimmy Steamboat 

An uncle jimmy steamboat is when one gets naked, inserts a vaporizer into one's anus, lies face-down into a full bathtub of water and vape as hard as one can.

Friend: You ever had an uncle jimmy steamboat?
Me: What the fuck is that?
*moments later*
Me: n- no stop s- st- stop sTOP STOP SOTPPPSPPP!!!!! AAAAAHHHHH!!!!!!!!!

Uncle Jimmy Steamboat by pieslorde July 11, 2016