Leightoned means you get friend-zoned with who ever it is (boys and girls). It means you willnever have a girlfriend or boyfriend because they are your friend. You have failed to impress and in doing so stopped your chances to copulate. They have been Leightoned.
Girl 1: Do you fancy him?
Girl 2: No, not really. I think he's been...
Girl 1 and 2: (simultaneously) Leightoned!
When you're still laughing about something that was funny earlier in the day or week; Laughter that spills out hours or days after something very amusing takes place.
Hey! Remember that joke you told me on Monday! I've been having laughtovers all week from that. So funny!