A person that is probably Jewish and is always looking for his next grandpa victim. A Greg will also definitely have a large nose.
by Ttap June 3, 2020
Get the Gregmug. 
A very selfless, humble guy that has a great sense of humor. You really need him to be your friend because he is just the right person to make you feel better when you are having a bad day. Is 100% honest with you, not one has he lied in his entire life. You will never meet anyone as kind as him. He also has the best, funniest jokes that will crack you up. Never underestimate this person.
Girl 1: Hey Shannon, uggh! I am having a bad day and got in a fight with my mom, what should I do?
Shannon: Oh, go talk to Greg, he is really understanding and will cheer you up right away!
Girl 1: Thank you so much!!! You are right, he is the best friend ever, I’m sure he will cheer me up!
Shannon: Oh, go talk to Greg, he is really understanding and will cheer you up right away!
Girl 1: Thank you so much!!! You are right, he is the best friend ever, I’m sure he will cheer me up!
by Billythegoat24593629 June 26, 2019
Get the Gregmug. Don’t get me wrong but some greg’s are nice. Never trust a south african greg though.. He will tear you to peices and lie to your face. Usually targets young females aged 15-16 but he will go for whatever he can get. Be careful. But for all the other greg’s just go for it. Make sure they aren’t South African before though :)
by Mia Dronow October 1, 2018
Get the gregmug. 
Get the Gregmug. Greg, a small but handy instrument used for picking fluff out of the belly button when lying on the couch watching tv. rare and expensive.
by crabwright July 30, 2008
Get the Gregmug.