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1.
to take a bladder-busting piss; to furiously urinate
"Pull over, you whore."
"Fuck you, Jim, just hold it in. We're practically home already."
"I gotta furinate, woman. This instant."
by Mofie February 23, 2005
 
2.
To furiously urinate.
Holy shit, damn I must furinate.
by Dumb__blonde September 21, 2013