tasting urine on the tip of one's tongue 

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.

tasting urine on the tip of one's tongue by Captain Pants December 26, 2008