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50.
a shortened version of the phrase "Massive Poop"
Herbie sat on the toilet and transcended taking a poop, it was much more massive; he took a moop
by mofotronimus October 10, 2006
 
51.
Acronym for Matter Out Of Place
mr. Belvedere was moop at the anime convention
by Helne April 08, 2005
 
52.
A neutral version of meep. Can be also used randomly..
1st person (who is excited): Meep!
2nd person (who is not excited): Moop.

or

Moop.
by ladyjulianne November 30, 2003
 
53.
A person that has sex with dead people.
eww.. she's a moop.
by Roman Anders June 06, 2011
 
54.
To burp while keeping you mouth closed, then tapping your sister on the shoulder and blowing it in her face.
She wouldn't change the channel, so I burped up some pizza and mooped her.
by W.E. Coyote August 20, 2003
 
55.
being extremely random and sexual almost homosexual during hyperactivity, with the exception of grabing ones breasts or penis
(or out of control)
"I was so moop today i walked up to a stranger and yanked on his crotch"

"that was my dad"
by ehna September 09, 2008
 
56.
An unreliable person. Someone who shows up late, doesn't pay rent or repay loans, can't hold down a job for very long, etc. Your typical moop has tattoos, piercings, court-ordered child support, a substance abuse problem and a petty criminal record. One step up from a rubadub.
I thought tending bar would be a fun job, but I couldn't stand listening to the moops tell their stupid fishing stories all day!
by paperbackwriter July 10, 2008