masticate

To grind teeth or chomp.
Most often used as a word that sounds like masturbate but is not.

Person A: "I hate that people who masticate!"
Person B: "Dude, you don't ... you know."
Person A: "Seriously, look it up. It's not what you think."
Person B: "Than what do you call --"
Person A: "Nevermind!"

by Nerd Jackson March 11, 2008