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MB stands for someone who likes to eat alot.
the term comes from "munch bunch" - a yoghurt food product.

they usually have a weird big sized head too.
"MB's eating once again"
MB by KawaiiKid June 24, 2009
Related Words
MB mbn mbs mbm MBA mbb MBP mbc MBD MBF
MB is a "French" secret congregation of Pb which the ultimate purpose is to conquer the world in order to spread an Mbique ideology. We can recognize a MB when she become a ZIG ZAGUS maximus,

You can try to catch one of them with some Banana...
maybe you can have the privilege to see the dromadary Dance ....The famous Mb's folk dance
Mb by Queen MB June 24, 2010
ted: Oh man, that girl is so hot.
fred: She's hot but psycho. She's definitely not MB material.
mb by locquackcious June 24, 2009
mb its not only Mega Byte.
It's also used as Mail Back.
person1: afk
person2: why now? -.- i must go now <.<
when u gotta re mb plx.

bad example but hmm...
mb by Killer2020 June 7, 2007
MB is an acronym for Magic Burst. Specific to FFXI, a Magic Burst occurs when a mage fires off a spell in co-ordination with a combo executed by bashers and damage dealers. In order to be sucessful and Magic burst must employ a spell of a type matching the combo being performed by the other members of the party. It is possible to have more than one mage complete a magic burst per combo.
We're pulling a Liquifaction combo so cast a fire spell for MB.
MB by Moonbug October 29, 2004