A verb to chew/tooth somebody's finger like a carp. Frowned upon in post-infancy.
Guy: Did you see Jim masticarping Phillip in the bar last night?
Girl: I don't go to gay bars.
Guy: No, he was just so drunk he started chewing on Phil's finger.
To grind or chew. It sounds like masturbate so dumb fucks who are too lazy to figure out its real definition assume it means masturbate. It's a funny word and has power.
Mom: Son, you have another phone call. Do you want me too tell them your eating diner?
Son: Yeah just tell them I'm mastacating! They'll deffinatley stop calling
"I grabbed a steak and almost stuck it into my heart to commit suicide."
"Snap was spying on me and he was taking a video tape of me! And Loopin was masticating to it!"
Bob: Hey, can I masticate here?
Joe: Sure, I'll watch you masticate.
Bob: I love mastication, and doing it with a friend is even better Joe: Now I want to masticate...