A Manhattan Moodswing begins when you are fucking a girl in the ass and you sense a sudden mood change for no apparent reason. You then lift a nearby cinder block over the girl's head and knock the bitch out. You then flip her over and start doing her hardcore in her limp vagina.
Haidyn: Zoie, what the hell is that on your head?

Zoie: I'm not sure, but I think I received another Manhattan Moodswing.

Haidyn: Damn, he knocked you the fuck out.
by Tee Nasty November 23, 2010

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