To excessively overthink an action or decision to the point of confusion in ones ability to make the choice.
I cannot decide what loafers to choose, I am really nikki-ing this decision.

I have done so much nikki-ing trying to decide what colour to paint my big toe.
by Jchis May 25, 2017
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The act of accepting a mans invitation back to his house just to get free coke and sneak out.
Bro I gave her a line and she hopped out my window she Nikki-ing
by Lelellelelele October 6, 2020
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