Crunch mute 

The effect you get when you eat something particularly crunchy (potato chips, cereal), and you can't hear what's on television or what people are talking about.

This can be either good or bad.

I wanted to watch CSI: Miami and eat my Doritos, but I'll totally get crunch muted, and I won't be able to hear vital plot.

Though the whole show is basically vital plot.

Crunch mute by Interactive September 30, 2009