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It's a word used to describe someone who somehow manages to piss on their feet while standing at a urinal.
*Ben walks into the toilet*

Matt says : "Oh my god, Ben's pissed on his foot again, what a 'piss foot'."
Ben says "Naa.. Rubbish man, it was from the sink, give me a break!"
Matt says "No way, from now on you'll be known as 'piss foot'"
by ken davies June 02, 2007
when your dog is too lazy to cock his leg up and just pisses all over his foot.
Chewy's such a lazy bastard he came in again with a smelly ass pissfoot.
by krisgsxr600 November 10, 2009