The Deuce is on the Loose

Euphemism for a bowel movement, especially diarrhea.

"Hey, how are you feeling? Any better?"

"Yeah my nose isn't stuffed up but the deuce is on the loose, still."

Ma Deuce is on the Loose!

Ma Deuce is on the Loose is military slang, for the effective use of a M-2 .50 heavy machine gun in combat.

The sappers try to cut the perimeter wire, but they get cut down when Ma Deuce is on the Loose!

Deuce on the loose

A turd that is anywhere except for in the toilet or in a person.

1.

Man! I need to get home quick or I'm going to have a Deuce on the loose!

2.

first guy: Don't go into the second toilet stall, there's a couple deuces on the loose.

second guy: Aww dude! Nasty! Where?

first guy: One on the floor and one on the toilet seat.

The deuce is loose

Taking a huge crap.

I had a dozen tacos for lunch and the the deuce was loose about hour later. Or, when you feel a huge crap coming on, you say "The deuce is loose!"