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The uncontrollable back and forth circular motions made by a woman's hips when her man has made her horny but is not there to satisfy her sexual cravings and NEEDS.
My hips undulate when I'm in the saddle, riding you.

My hips undulate wildly when you are far away and we have phone sex. That's phone fucking at it's best.

When you talk naughty to me like THAT, my ass take on a life of it's own, undulating relentlessly while your words make me cum over the phone. I quiver. I convulse, I spasm. I cum. Undulating ceases.
undulate by zazz July 28, 2012
Related Words
It is a term know within the European CS:GO community and derivates from "unlucky". It has been made popular by players like Lobanjica, Stark & JW ( steamcommunity.com/groups/Unlukers ) while streaming FPL (Faceit Pro League) Matches on Twitch.tv whenever a player messes up a round.
*player dies* "Unluko brother."
unluko by Cru_ June 3, 2018
To undo the effect of dubbed voices by restoring those used in the original language. Usually used in the context of video game modification.

This word may be used as a verb (process) or noun (product).
I played the undub version of that game because the english voices were terrible.
undub by just a traveller March 19, 2008

unduplicable 

unduplic(at)able; incapable of being duplicated
1) That guy's rad dance moves are unduplicable.
2) Her elegant cursive handwriting is unduplicable.
unduplicable by zekeolis January 25, 2009

unducate 

To do a horrendously poor job teaching.
unducate by typo-definer October 29, 2009
Getting smarter by hanging around a smart person.
You undumb me because you're so smart.
Undumb by Brenpit2 August 14, 2018