The full expression is, " Finders, keepers, losers, weepers, " meaning if I find it, I get to keep it, and if it is yours, you lose it and therefore you will cry, you will weep.
完整的表达是, “Finders, keepers, losers, weepers” ,意思是如果我找它,我就会保留它, 如果它是你的, 你就会失去它, 因此你会哭泣,你会哭泣。