In addition to being a somewhat famous singer, it is also a new slang term (code) for instructing someone to pick up a "gar" (dutchmaster, philly, swisher, etc.). It originated in Miami and is slowly gaining steam across the country.
Greta Garbo = "Get a 'gar, bro!"
Greta Garbo = "Get a 'gar, bro!"
::ring ring::
Person A: Hey, you around? Let's burn!
Person B: Sure. Greta Garbo.
Person C: Heard! I'll stop by the gas station.
Person A: Hey, you around? Let's burn!
Person B: Sure. Greta Garbo.
Person C: Heard! I'll stop by the gas station.
by The Originator of Greta Garbo May 2, 2011
Get the Greta Garbomug. 
A fucking awesome band that consists of 3 brothers, Josh Kiszka (lead singer), Jake Kiszka (guitarist), Sam Kiszka (bassist), and their friend Danny Wagner (drummer). They're from Frankenmuth, Michigan, and make great music that takes you back to the 70s. They are all in their early 20s and extremely talented. It is only the beginning for them.
by gayle23 May 10, 2019
Get the Greta Van Fleetmug. -hey did you hear the new greta van fleet album
-fucking obviously they’re the best band in the history of music
-fucking obviously they’re the best band in the history of music
by sammys gurl October 9, 2021
Get the greta van fleetmug. A dirty Greta is typically a female who is filled with Botox, tan, nails, lip injections, Shit tats that will generally jump on any dick wether it be a human, animal or even alien.
by Timmy111222 April 3, 2020
Get the Dirty Gretamug. When a middle-aged Mom becomes a groupie of a boy toy band and constantly fantasizes about them whilst getting plowed by Dad.
by Crandall Kiszka April 20, 2019
Get the Greta Van Fuckmug. 