Small bursts of seemingly random laughter shortly after hearing something extremely humorous, especially when you think about it again.
That was so funny, I'm still having laughtershocks from it!
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When a person, usually a young male, starts playing the free online MMORPG Runescape again for a short amount of time, despite past attempts to quit the game.
Man1: Hey dude, where's Brian?
Man2: He's playing Runescape.
Man1: Didn't he quit that game a year ago?
Man2: I guess he had another runelapse...
When somebody tells a joke, and another person almost immediately tells a much funnier joke about the same subject.
Nick: (Insert lame joke about Dan here)
Adam: (Insert funnier joke about Dan here)
Dave: Jokeslammed!