Mines

[Britney]

a word that dumbasses use to mean possession.

[Dave Paprocki]

The use of this improper grammar most likely branched off from the contraction mines (or mine is). For example Your ice cream is vanilla, and mines chocolate. Somewhere along the line, someone forgot that is is already part of mines and they made the mistake of saying things like Mines is strawberry or (Mine is is strawberry).
Eventually, the singular form of the word was completely dropped from the vocabulary, and mines became used to show all ownership, even when adding is is inapplicable.

[Justin Bieber]

An explosive device meant to explode when youre near it.