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The process of extending one's name with "in", adding it to a vanity license place, and, therefore, becoming a complete douche.
Greg's new license plate is "Greggin." What a douche.
Greggin by Daughterkickedmydog April 12, 2010
ADJ.
1. extremely large hole.
2. gaping
Tony's asshole was greggin after going to confessions with father chapholte.

The hole was greggin.. like throwin a hotdog down a hallway.
greggin by thebombdizzle May 5, 2007
the act of lying bolefacely infront of ones friends. especially about getting with girls from school *coughlawrenceprepcough*.
"yo dolla, i went to Kr*sten's house last night and we was gettin it on."

"kr*sten G*****s? stokes ur 'greggin', there's no way u got with that trick"
greggin by Dolla hustla December 19, 2007

Greggin’ 

The act of glazing someone or something with semen, much like an iced doughnut from Greggs.
Dude, I gave her a real good gregginlast night. Looked like a yum yum afterwards.
Greggin’ by Mxcky July 12, 2019
The act of being late when meeting a group of people for an event, either due to outside circumstances or personal laziness.
"Don was supposed to hit the road at 9, but he's Greggin it"
Greggin by Oniwana December 14, 2009
going out drinking/socialising with friends

Greg is a drink. It is also used to describe a person that is drinking the drink.

gregged someone that has drunk too much
Are you greggin it tonight?

Do you want a Greg?

Greg You were so gregged last night? How much did you have to greg
Greggin by Greggina April 6, 2009