Up the switch

A term referring to pulling a Glock (Or pistol) from your waistband, modified with an Auto sear as seen in examples I.e. mounted on the back plate of a Glock.

This term can be loosely applied to rifles as-well.

"Boy I'm really bout to up the switch on yo lame ass"

"Nigga you better get your crazy talking ass outta here before i up the switch on you"