The picture you paint with urine while peeing in public.
Mohammad was wasted, but you gotta respect the murinal of the Mona Pissa he left on the wall outside.
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A mural or painting on a toilet or toilet block. Public toilets are often painted with a picture depicting the area and its history or to brighten them up.
I like that painting on those public toilets, it is a really nice Murinal.
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To donate semen at the fertility clinic in exchange for money. Derived from the nickname of a certain college student who financed his beer supply doing just that.
Said donation is commonly referred to as a "Murination"
Man, I'm dead broke again. Time to go down the street and murinate, I guess.
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Relating to a combination of mould and urine
There subway smells of murine all the time