When 3 or more people float next to each other in an ocean or lake, and all pee simultaneously. Likely the result of alcohol consumption.
"After spending the afternoon drinking beers on a boat, Heather, Jessica and I had a peesome while floating in the lake."
Combination of to pee and threesome when at least two persons (mainly male and drunken) pee in one loo sink.
Susan at the pub: Hey guys I am next and there is only one toilette working, can you please hurry and peesome?
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