The act of dropping out of a trip or group activity last minute without notice. Doing so with complete disregard to personal or friends financial losses.
"Where is Martinez?" "I don't know, he mentioned not coming because of his girlfriend being lonely, he's totally pulling a Greg."
"Where is the last groomsman?" "He hasn't answered any texts, he's probably pulling a Greg."
Basically, the term for when a guy messes a girl around. They lead you on and then come up with a big pathetic excuse or 'problem' that is so 'horrible' that they cannot tell you meaning they cannot see you anymore. they either get with an ex or with a new girl and they also say the famous line of 'i didnt mean to mess you about'. blatently did if they had said that otherwise they wouldn't know so soon that they had.
natalie: so how did your datego?
emma: not too well, he did a greg.
"Being around them is like trying to catch a butterfly in a storm: they're always late, their attention span is as short as a squirrel's, and their texts are like a maze of run-on sentences designed to confuse and confound."
I was hanging out with my buddy Smiles last night but he was being a “being a GREG”