To have a pissing fetish or uncontrollable urge to piss on someone when they don't want it.
Also the biggest form of idiotcy. Being the biggest jackass, loser, cum-goblin someone can be, the ultimate ass clown.
Hisaw got so drunk last night that he didn't just hose his wife he pulled a Hoosy all over her.
You can say it was an accident but we all know you wanted to Hoosy that hoe.
John got caught with the dog licking peanut butter off his balls last night, what a Hoosy!
Fuck you! You are such a Hoosy!