Short for megalomaniac, someone with a huge ego and extremely arrogant, frequently out of touch with reality. James Bond's enemies are an excellent example.
That guy is really a meg because he thinks he's such a big shot but he's the only one who believes it.
by Cumbre Vieja October 1, 2023
Get the Megmug. It's a good thing I never had a girl, me and her would just have to end up paying attention to Meg and her needs. Let's get rid of all our material shit my girl and I and get ourselves put out in the street, it doesn't matter as long as we're paying enough attention to Meg, she's such a sweet person! As long as Meg gets to live her cult dreams, nothing and nobody else matters does it?
by The Original Agahnim December 29, 2021
Get the megmug. by the other taco May 27, 2022
Get the meg oomug. When you get in the wrong rental car, drive it away, and keep it for a week, resulting in the rental company reporting the car stolen.
by Tweedle Dee September 17, 2012
Get the Meg rentalmug. An unfaithful home wrecking woman that does coke and cheats on all her significant others with any man her deceased cousin has had a personal relationship or sexual contact with that tries to force a relationship with them while still cheating and using black mail in order to try and keep them.
by Chy Euphoria May 4, 2022
Get the MEG-Againmug. 
by Ninina September 21, 2019
Get the Meg wastedmug.