Taking care of mother fuckin' business. Getting your shit done in a particularly intense, efficient and enthusiastic manner.
A: "Hey, how's it going over there with getting all your paperwork done?"
M: "It's going great! I'm TCMFBin' over here."
A: "Awesome! I love it! Way to go!"
M: "Thanks! You know me, I don't F around!"
A: "Oh, I know -- you're always TCMFBin'!"