Top definition
Acronym.
Muddy Bum Crack
An act performed by a group of roudy rugby players, in which they victimise a birthday boy, by tackling him to the ground and restraining him, whilst others take clumps of mud and shove it up his butt.
Defensive line: hold, ready, MBC
Birthday boy: arrgh noooo, let go, get out my ass.
by Bryan manderson April 15, 2008
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Jul 15 Word of the Day
The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.
Billionaires are having a dick swinging space race while the earth experiences record breaking heatwaves that cause sea creatures to literally cook inside their shells. We need planetary quarantine.
by monkeylabor July 14, 2021
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3
Massasecum Board Crew

A group of ill nasty thugs, located in the ghetto of Bradford, NH, proud owners of lake massasecum, and hell bent on wakeboarding all year round.
Shredding Gnar Like Paul Krebs All Year Round.

MBC^
MBC WHAT!
Chris Bish founder of MBC.
Ian Nevins dedicated dancing irish leprauchaun of MBC.

by Peter Arnold August 03, 2006
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4
May Be Criminals
The bunch of M.B.C's hanging by that street corner makes me nervous to wanna go out there.
by Nana GQ October 02, 2008
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6
Menstrual Blood Chunks; bloody, messy chunks of digusting shit that excrete from a girl on her period. MBC, a great nickname for someone who does the below.
Charlie's drunk ass didn't realize for about 3 hrs that his face was covered in MBCs(Menstrual Blood Chunks) from his previous rondevou with his ex girlfriend. Somehow he didn't know that the bitch was on her period and he still gave her head.
by mattman February 12, 2005
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