A decisive point in an argument when somebody's point becomes entirely invalid by making a simple mistake. Derived from the thought process of stepping on a Green Bean while delivering a skull crushingcomeback.
Person 1: "so to conclude, I **stutters** I.."
Person 2: "nah shut up man thats a green bean moment, you're done"
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.