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1) When a person goes down on someone, as like on a one-night stand.

2) Getting head from someone just one time.

3) A one and done sexual encounter.

4) Receiving head from a rando, one time, never seeing them again.
Dude, I was at this bar and I met this chick, we went out to my car and she gave me a monobob.
Monobob by T T 81 February 15, 2022

monoboob 

The unfortunate (but often hilarious) result of a busty woman fitting herself into a swimsuit too small for her body. The suit's tight fabric crushes her breasts together, creating a single, enormous boob in the center of her chest.
D00d, that chick's monoboob is outta control! She looks like a boobclops.
monoboob by Tommy Wommy Womsters January 23, 2005

monoboobular 

only having one boob.
that chic is monoboobular.
monoboobular by susieq55 July 20, 2008
A cute boi. Much loaf. Likes to sit next to the window and think about the meaning of life. Arch-enemy of Bobster (aka Bodin Demon Queen).
Person: "Hi monoboi!"
-Bodin demon queen gets summoned from the depths of hell-
monoboi by Mimsers July 20, 2022

Monoboob 

A word used to describe boobs of Amazonian war princesses who wanted to cut off their boobs for better performance at battlefields but made a compromise to cut only one side as they had to breastfeed babies. It is an old, traditional custom that goes back to as far as the Golden Age of Greece, but is often overlooked by commercial businesses that make movies with pretty girls that have both wild tendencies and boobs.
Why doesn't Wonder Woman have monoboob too?
Monoboob by EunhaeLee May 31, 2017
A handjob, more specificly when a naked girl sits on you wile giving you a handjob
Here babe, i'll lay here while you give me a monojob
monojob by Bretskii March 30, 2008