Gutterball fart 

1. The travel of flatulence from the rectum, along the canal formed by the crevice in the buttocks and the vaginal folds, through to the vagina, at which point it exits the body. Can be compared to a game of bowling where the fart bubble, represented by a “bowling ball,” is released with great force down the rectum, or “laneway,” only to get trapped in the gutter and released out the end, rather than travelling straight up the lane and knocking down pins.

2. A fart that comes out your vagina.

"I am so awkwardly gassy today. I keep having gutterball farts!"

Gutterball fart by Ryeschmo September 1, 2009