is it a date, is it a mate. Meeting someone from the opposite sex who you know well enough to call a mate, but there's also a bit more going on. It goes somewhere, but at the last minute when you're about to stick it in (for lads) or you're to be stuck (for lasses, maybe lads) they call the mate card.
Albert: "How did it go with Angela last night"
Ronny: "Yeah it was going really well, she was naked and that and we were about to do it but she pulled the mate card."
Albert: "Nooooooooooo, bitch"