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!"

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