MIB
MIB has 2 meanings
Mint in box
Example
Stan Lee Funko Pop MIB - signed by Stan Lee
A MIB Barbie accessory pack on eBay
MIB definition by Slang.net
This page explains what the acronym "MIB" means. The various definitions, examples, and related terms listed above have been written and compiled by the Slang.net team.
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On online auction and sales sites, MIB stands for "mint in box." This acronym means the listed item is in perfect condition and has not been removed from the box in which it came. Typically, it also means the box has not been opened.
You're most likely to encounter this acronym in listings for electronics and collectibles. Those items' condition can highly affect their value, so sellers use the MIB acronym to denote that the items are in mint condition (and should, accordingly, fetch a higher price).