An alien looking mofo who has an extremely small penis and has a hobby of inserting large sharp objects into the anal cavity. Typically a Gregg can be found in slums of most neighborhoods offering blowjobs to minors for a jolly rancher. If you see a Gregg, report them to the closest police department immediatly.
Kid: Hey dad look! theres a homeless man touching bobby's privates with his mouth!
Parent: Yes son, That is what we call a Gregg
A unit of length. 1 gregg = 1.35 inches. Can be used as a conversion factor between the Metric system and the Foot/Pound system. Based upon the penial length of a mythological man named Gregg/Garry. Used in scientific studies as well as daily life.
Dude, your car is going to get a ticket since it is 7 greggs away from the curb!
A Gregg is usually a kind and generous, but also a very complex person. Gregg is also a term used when describing anger or road rage. A Gregg is usually a prick to others for no reason at all.
I'm sorry I spilledwine on your carpet, but you don't have to be such a Gregg about it.