A guy you mess around with when you hang out with him for no apparent reasion. You do this even though you know better, it happens almost everytime you hang out. This is how someone becomes a Mansteris. These can be good things or bad things. Mansteris(s) can become very negitive people in your life and an object your friends will use to make fun of. You and your mansteris(s) activities usually take place in random places when you don't think your friends are looking.

(1)Hey Rebecca, there goes your mansteris, boR.
(2)Omg! she made out with her mansteris in the woods at his party!?

Mansteris by [Letsgo4awalk] September 30, 2006

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Manster

a large, furry creature: part Man, part Monster

My furry Manster engulphed me in warm snuggles to keep out the cold.

Manster by Sedona1 October 18, 2011

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Mansterics

Descriptive of an otherwise MANLY man suffering a period of GIRLY behaviour when his manliness is challenged by other MANLY men... thus provoking the suspicion that he may not be very MANLY at all.

*At the gym*

"Hey AJ, why did Billy just punch the wall, throw the contents of his locker around the room, and run outta the room screaming?"

"I dunno Matty... all I said was that he was lookin' a little outta shape and should maybe work out a little harder"

"Wow!... I aint never seen Mansterics that bad before. Guess he must be on his Manstrual Cycle

Mansterics by aaaaajon January 20, 2012

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