When one feels pressured to laugh at something after the joke has just passed. This usually occurs when someone friend, peer, etc. laughs hysterically at a joke, while you remain silent. To make it appear that you're not a total dipshit, some may grunt afterwards, or even laugh a few seconds later; both ways show that you are socially awkward when it comes to the timing of your laugh.
Micheal Scott(on T.V.): That's what she said!
Miguel: HAHAHA. That was raw.
Ron: Huh? Uhh...yeah. Ha.
(after a few moments have passed)
Miguel: Wow dude. You totally