Origin: The common use of the greeting "Cheers!", when spoken with an English accent, seems to be very attractive to women. Many hook-ups have been cemented through the utterance of "Cheers!". The fact that an accent coupled with a single word could invoke such a strong reaction, is awesome. Therefore, CGP (or Cheers Gets the Pussy) is used when describing something very cool.
Negative: "Uggh, that new Carrot Top movie was un-CGP in every way."