Catch a Thumb
The act of putting ones thumb into the rectal cavity before, during, or even after intercourse.
See that girl at the bar? She could catch a thumb.
Catch these thumbs
Fighting or serving/ about to serve your opponent an ass whoopin in video game.
Person 1: okay, play me on Mortal Kombat and I'll beat you. Person 2: Oh really! Boiii your gonna catch these thumbs!