Broadly, a reference to any Muslim found scurrying around in caves, especially the dirty and diseased ones. However more specifically, the Mujaheddin.
Dude 1: "Hey bros, look at the TV. They're bombing these musrats outta' their holes!"
Dude 2: "Sweet!"
Dude 3/4/5: "Rad!"
Dude 2: "Sweet!"
Dude 3/4/5: "Rad!"
by SamboiChip February 03, 2019
by Petergriffin#awesome December 12, 2017