The c.u.p.i.d system or "cupids" was devised by the singular Alex Zavos of Cambridge in the year of our lord 2006.
C.U.P.I.D. stands for "Cunt Until Point Is Disproven" and is a system for choosing friends which weeds people out by instantly assuming everyone you meet is a twat until they prove to you that they are not.
A: Steve's just run off with my wife!
B: The cunt! But i thought you two were mates.
A: I know, I know I'm too trusting I should have used the c.u.p.i.d. system like Alex said.
B: Oh well at least you'll know for next time, lets go get pissed