Derogatory term for Wrigley Field; commonly used by White Sox fans; describes the pungent odor of the stadium due to the open trough urinals, leaky plumbing, and poor aim of drunken frat jocks.
I went to the Urinal to watch the Crosstown Classic, but couldn't enjoy it because some Flub fan fratboy spilled his beer on me in the third inning.
Other than its literal definition this term is often used to explain something that is unwanted or unexpected. Most often referring to an unwanted event or guest.
Me: My 30 year old brother had a fight with his landlord and has moved back in with me and my dad because of his complete inability to take care of himself.
Friend: Yeah, he sounds like a total turd in the urinal.