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3.
Background: Was first used in a song by the trio Hanson(See Hanson)

Definition: An unrepeatable moment
"In an mmm-bop they're gone"
by Fresh December 18, 2004
 
1.
Mmmbop (oom' bop)

n. 1. When something cool happens
2.time travel, or telepathy
3.form of agression
when something cool occurs,“mmmbop, yeah”,
when you see a hot girl, “mmmmmmmmmmbopppaaaaa”
as a form of agression, “don't make me mmmbop you”
"I don't wanna kick you down and mmmbop on yo face," or "in an mmmbop you're gone"
by Hfan January 31, 2008
 
2.
3-way male orgy, as in "male-male-male bop". 1st popularized in the song of the same name by the group "Hanson".
"Mmm bop, baby; oh yeah"
-Hanson, from the song "Mmm bop"
by JimmyJoeb September 09, 2007
 
4.
3-way male orgy, as in "man-man-man bop". The term was 1st popularized in the '90s with the hit song of the same name by the group "Hanson".
"Mmmbop, baby; oh yeah"
-Hanson, from the song "Mmmbop"
by frackledart December 22, 2011
 
5.
Mmmbop (oom' bop) n. 1. An unrepeatable moment.

2a. A short frame of time. 2b. An instant.

(Latin: umbopus: A good time.)
"That summer breeze came and left in an mmmbop."
by Kate February 22, 2004
 
6.
A ridiculously cheerful song by the pop-rock band Hanson, released widely in 1997, and was a huge hit. Despised by many, but beloved by true Fansons.
I hated MMMBop at first, but it grew on me eventually.
by xcarex November 03, 2003
 
7.
A moment in time. A short period of time.
In an MMMBop they're, in an MMMBop they're not there
by Tara October 01, 2003