Top definition
A dramatic change of any sort resulting from Momo.
Girl: It's crowded in here, i dont know if i'll fit in.
Momo: Hey, you'll fit in, here, i know these ppl, and these ppl...
*5 minutes later*
Girl: I can't believe i'm having so much fun!
Momo: Yeah, thats the momo effect.
by Momopeachgod1 March 05, 2010
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