MIB 

1.'Men in black' as in the movie, shooting aliens up and stuff.

2.Manchester united FC away supporters/fans/hooligans are often to referred as the red army, MIB or 'men in black' due to there dress code which is predominantly black.

1.Kay: Set for pulsar level five, subsonic implosion factor two.
Jay: What?
Kay: Just shoot the damn thing on the count of three.

2.rival supporter:Get our fackin boys together, the MIB are coming to town tonight.

MIB by ICJ May 7, 2009

MIB 

Men In Black, what else could it be, that makes sense?

MIB fight those damn aliens, be damned if they come back alive, all ye of evil consciousness.

MIB by Alexi October 19, 2003

mib 

mint in box; used to describe item for sale on ebay, for example

"mib" items are generally more expensive

mib by Mike January 12, 2004

MIB 

a mentally ill brother who’s poor mental health negatively impacts their siblings, causing said siblings to adopt a MIB liftestyle thus inducing tramua that makes them mibful

My brother punched a hole in the wall then stole my parents car, he’s such a MIB!

MIB by mibala June 13, 2023

mib 

An idiot using Mibbit (a popular web-IRC service) to connect to an IRC chat without changing their name and usually ask idiot questions.

*** mib_asdq32 has joined #channel ([e-mail])
mib_asdq32: you moderators are NOOBS!!!
operator: another frikking mib.

mib by NTAuthority June 19, 2010

MIB 

An abbreviation for make it bacon. Usually used in reference to a larger girl. Mib 2.0 is a younger fat girl (under 21 years of age... usually blonder aswell), the second generation.

Wow that larger girl is a real mib.

MIB by RIPOM April 3, 2009

MIB 

MILF IN BOOTS i.e. mum I'd like to fuck wearing boots.

Commonly seen during the colder periods of the year, the milfs will wear knee high boots with jeans, to stay warm while maintaining sex appeal.

A sexy mum in winter wearing boots is a mib

MIB by satanico pandemonium September 19, 2012