Grimin it up

The process of shiting on the floor in the middle of a mosh pit. The ensuing chaos that follows results in the floor being covered in a thick layer of excrement, therefore, griming it up

After peer pressuring our friend Ben to no end, he jumped into the crowd and started Grimin it up. A few short minutes later he was escorted out by authorities

Grimin'

Aggressively eating large amounts of food.

Joe: What are you up to man?
John: Grimin' at Taco Bell