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!!!!!!!!!
by pieslorde July 12, 2016
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