An exclamation used to inform one's friends and acquaintances about a successful hook-up. Only applies to sexual intercourse, although fewer points may be allotted for scoring a base run if the player doesn't make it all the way home. Especially useful if you don't want everyone in the room to know about your sexual escapades.
Person 1: Hey man, where were you last night? We waited for an hour before we left!
Person 2: Yeah, sorry bro, got tied up with that girl from the club. But hey, Ten Points for Gryffindor!!
Person 1: Oh, we're cool then