The condition in which one needs to urinate so badly that any further delay will cause bladder rupture.
I think tasting urine on the tip of one's tongue is a sure sign one is in trouble.

I held it for as long as I could, but when I tasted urine on the tip of my tongue, then I knew I was in trouble. I had to pull over and go in the ditch.
by Captain Pants May 4, 2007
Get the tasting urine on the tip of one's tongue mug.