middle cheek leak

A atrocious fart that comes out your buttox between your right and left booty cheeks. To prevent sound you lean forward and shove your buttox backward, then sit as fast as you can, flat, to prevent a really ear-rippling sound that your comrades will hear.

Johnny hit a middle cheek leak in the middle of class and his ass cheeks wobbled back and forth.

The whole class turned to Johnny cause he forgot to sit down fast, and everyone heard and smelt his atrocious fart.

"Yo, Johnny just hit a middle cheek leak"