When you are irritated and/or agitated from not being able to release your bladder for urination.
Dude 1: "dude I have an itchin' for pissin'."

Dude 2: "why?"

Dude 1: " because their is no where to take a leak!"
by ATWONTHEGREAT December 26, 2011
Get the Itchin' for pissin' mug.
The sensation of having to urinate extremely bad, resulting in restlessness, discomfort, and even considering unconventional spots as possible urination locations.
Person 1- Dude, did he really just piss in soda can?

Person 2- Absolutely. He really had an itchin' for a pissin'
by domanthojoeyantwon December 26, 2011
Get the Itchin' for a pissin' mug.