Where you get a tube and a bunch of lube and stick a live mouse in the tube and stick the tube up your asshole. Remove the tube and let the mouse wiggle inside your anus until it dies.
Another way to ask if the person is a pussy or not on a dare/action they’re about to do.
Guy 1: “Dude, u finna down that bottle of Tito’s?”
Guy 2: “Not sure bro, this may be too much for me,”
Guy 1: “Come on man, are you a man or mouse? Think about it,”
Guy 2: “Hmmm, fuck it. I’m a man, I cannot go out like this!”
Guy 1: “Let’s fucking go!!!!!”