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1.
Assistants to the big cheese in the office.
The underling's job is to fetch my coffee in the morning.
by Sandi68 April 13, 2006
 
2.
A brutal metal band from Southern California.
Did you see Underling at the show last night? They tore up the stage.
by Dead Fish March 08, 2006
 
3.
A subset of the nerd they outcasted from even the Nerds, their skin a very very very pasty white and most of them speak Clingon...in binary. The lowest of the low, they also act strangly and Almost never go out into the sun without a cloke, they are few in Number but Contrations are higher in Metropolitian areas. Not even the Nerds hang out with them.
Guy1: hey look its a table of nerds.
*sees a dorkish dork*
Guy1: wait what the hell is that?
* the Mysterious figure sits with Nerds, Nerds get up and leave the table*
Guy1: wait what the? I thought Nerds would hang out with other Nerds not get up and leave one of their own?
Guy2: dude that is not a nerd at that table dude, Its something even lower, The Mysterious Underling, This is your first time seeing one isnt it?
by The Great Underling watcher February 14, 2011
 
4.
The end result of beer, burritos, and bowels producing a loose, smelly, wet, stool-like substance that clings to porcelain.
The maid is going to be very upset at me for the underling I left in the toilet.
by Reinier August 21, 2003