Old Man Fart 

Typically, a musty smelling fart that lingers for several minutes.

"Damn, Ralph ripped an old man fart!"

Old Man Fart by stinkyshitbritches May 31, 2018

Old man fart 

A fart that smells like air off shit passing through a 12 day old egg that has been sitting in the sun.

Johnny!!! You and your old man farts yah stinking cunt!

Old man fart by Karen from rothwell. November 7, 2020