1) A combination of a ribbon, trophy and achievment. Often used in casual games.
2) Slang within the casual game industry for doing good deeds in relationships that will end up in sexual favors in return.
1) Rookie just earned an Ridalphy for scoring 1,000,000 points!
2) By getting her flowers and making her soup when she was sick, I earned a ridalphy that I can trade in for some blowjobs