finders keepers, losers weepers

Finders keepers, losers weepers is the idiom used for finding something that didnt belong to you, but you can now claim is your own. This is an old saying which indicates that if you find something which seems to be unclaimed or abandoned, it automatically becomes yours regardless of who might claim it a later date. Finders keepers, losers weepers is usually spoken by schoolchildren when they find something and claim it as their own.