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2.
The action of waking up in the morning going and hanging a slash and busting a phat ass fart whilst pissing
The other day i heard jimmy get up in the morning and bust a phat urinart, it was so loud i think he may have shat him self
by Jimmyjames187 September 25, 2006
 
1.
Drawing a picture in freshly-fallen snow using urine
Man 1: "Wanna see my urinart?"

Man 2: "Ooh, a unicorn!"
by JTRones August 30, 2009