butt growl

When your intestines make a churning noise -- similar to your stomach growling -- but you feel it in your butt.

"Dude, did the phone in my back pocket just vibrate, or did my butt growl?"

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Butt growl

A fart that you successfully keep from escaping but decides to let loose inside and resembles your stomach growling loudly but clearly is not coming from your stomach.

I held that fart in but everyone still heard my butt growl. I was so embarrassed when my butt growled in the middle of class.