Acronym for Let's Just Shut This Fucker Down. To be said upon discovering alcohol fueled madness at a late hour in one's dwelling. Must be said after holding one's head in one's hands and running hand through hair with an exasperated look. Often paired with GTFO or the ego-syntonic PTFO (peace the fuck out).

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.