Grincho mode

An increasingly popular term used by hood rats who uncontrollingly lose their rag.

The festive act of going ape shit.

The waiter brings over my peng bacon fries, oh no they've forgotten the bacon (*DEPLOY GRINCHO MODE*)... waiter ends up in the deep fat fryer, he'll never walk again.

The caretaker walks out of the toilets having just snorted a line of Ketamine, he looks around and sees a kid giving him the evils (*DEPLOY GRINCHO MODE*)... The kid ends up with his face in the urinal and has to spend the rest of his life eating through a straw.