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Something extremely adverse (see: negative).
The torrential rains had a megative effect on my golf game.

I hope my addition to the Urban Dictionary does not megatively affect Roy Blount's on-going efforts to be honored in a similar fashion.
by Tad McDonald February 02, 2009
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2
The absolute opposite of negative, even more so than positive.
Franklin: "Dude, she has lots of money and huge titties!"
Stuart Skauge: "Megative!"
by Tween October 06, 2005
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4
When your Ex is trying to replace you with someone that resembles you but is a lesser version
Did you see the girl Roger is talking to she is such a megative of Jen
by CertainlyCecil May 05, 2017
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