A phrase used in the In The Groove (ITG) dance game community that is used to express the idea that they have scored well on a song or have streamed 16ths at a fastBPM.
often times defined as practicing Mixed Martial Arts with buddies, but usually a cover up to blow your some dude named Matt behind the gym.
Also refer to the word Jim time
Dan: hey brett what were you at the gym for four hours for?
Brett: ooo just lifting weights, cardio, and a little bit of "Matt work"
Dan: sounds pretty gross.