a favorable juncture of circumstances when a person realizes the need to fart and can do so by relieving the need (farting) in a area occupied by other people and then vacating the scene.
Tyrone: Yo man, look at that those two black guys coming down the street.
G: Yeah yo thats a chopportunity if I've ever seen one.
Tyrone: I bet i could chop all these rocks to those fools!