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n. A (very) public drinking fountain, where (homeless) people may have urinated.
*Alice and Bob walking in a park*
Bob: Hold up, I want to get a drink of water.
Alice: What, in that hobo urinal? How can you drink the water when it smells like rotten piss? Just wait until we get home.

*Couple of drunks walking in the park at night*
Guy 1: Man I gotta piss.
Guy 2: Me too!
Guy 1: I'm going to christen this hobo urinal.
by HondotheHappyHobo April 11, 2009