crunch bump

The two ticks up in volume you do on a tv, computer, or other audio source when you're eating a crunchy food so you can still hear it.

"I was watching The Big Bang Theory and opened a bag of pretzels, so I had to crunch bump the volume."
"I know exactly what you mean! But dude, I didn't know you watched The Big Bang Theory. We can't be friends anymore, sorry."