What is the meaning of Peter?

The penis.

A safe.

A prison cell.

Chiefly followed by out: originally , of a vein of ore: to be depleted of ore; now , to diminish to nothing; to dwindle, to trail off.

Synonym of blue peter; to call for trump by throwing away a high card while holding a lower one.

a godfather

misspelling of petit (“small”)

Source: wiktionary.org