(noun) Like the name suggests, turd fly refers to the flies that sit on feces. It's used to describe any person who is nasty, acts annoying, or is just a jerk in general.
The act of a male or female shitting so hard that it flies out the window at lightning speed, and hits a neigbor's window shattering it, then the person or people slip on the shitty floor hitting their heads on the granite counter as they go down.
" man, that flying thunder turd sure caused some shit for ol' mr. jenkins didn't it?