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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
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Things that would hurt if they kicked you, because they have hooves. HOOVES, DAMN IT.
He's just un ungulate, marg, he can't COOK!
ungulate by unFalln October 13, 2004
Related Words
moving from side-to-side or back and forth; rocking, basically the motion a female does when shes riding you
that boat undulates in the water

I like it when she straddles me and undulates
undulate by suprmn90 June 2, 2010

unjucated 

The quality of being so uneducated, you can't even say the word 'uneducated' without screwing it up.
Billy was so unjucated, he couldn't even dress himself.
unjucated by punkie078 November 13, 2004

Tri-Ungulate 

Any Odd-Toed Ungulate that has three toes, such as a rhinoceros.
Any Odd-Toed Ungulate with three toes should be reclassified as a Tri-Ungulate to differentiate it from other Odd-Toed Ungulate that have only one, such as a horse.
Verb. The act of urination.

Given because of the oscillating motion made by the penis upon the sucessful completion of a piss to dislodge any dewdrops.
The large phallus undulated a stream of hot liquid into her eyes.
undulate by Beaver Muncher November 23, 2004
You probably don't want to know, but it sounds like one of those words you learn in health class. Yeah.
Holy sh!t! How did that undulation end up on the wall!

We had to evacuate the pool because she undulated in it.