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1.
Somebody who has enuresis (pisses the bed) well past his or her childhood years.
{Dave; at a jr. high basketball game to his 12 year-old stepbrother}: He wets the bed, urinehead!!!
by Telephony April 09, 2013
 
2.
Asian male (or maybe female too), who has bleached his hair to look cool. While asian peoples bleached hair does not look blond, but more like some yellowish color like urine. So it looks like some person who has urine colored hair on his head.
"Oh look at those urine heads over there"
by Sadolf April 04, 2008