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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

Unpubertic 

The opposite of going through puberty;being immature.
Simp:look at josh he is so unpubertic

Unpublished definitions 

Stupid fucking urban dictionary never published my definitions. FUCK YOU STUPID URBAN DICTIONARY
Unpublished definitions
Unknown subject. (Used often in TV and films dealing with crime.)
Our unsub is most likely a white male in his mid 30s, with a penchant for Star Wars action figures, and chocolate milk-type beverages.
unsub by Ted Strong January 1, 2006

unpuberdized 

The state of being when one who hasn't been through puberty or one who hasn't started.
The unpuberdized kid can't get a boner for his life
unpuberdized by Tripod Bob May 6, 2008

unsubscribathon 

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un.sub.scrib.athon
Pronunciation: &n-s&b-'skrIb-&-"tha:n
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1 : a sequence of list removal requests sent to an unmoderated,
over-subscribed email list, rather than to the owners of the
list; specif: such an event in which each removal request
encourages another to be sent by the next most irate subscriber;
a situation embodying both dramatic irony and a tragedy of the
commons: marked by both incongruity between the actual result of
a sequence of events and the intended result, and by the abuse
and consequent destruction of a non-excludable public good.
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Etymology: English, un- + subscribe + marathon, from un-, Middle
English, from Old English; akin to Old High German un- un-,
Latin in-, Greek a-, an-, Old English ne not; subscribe, Middle
English, from Latin subscribere, literally, to write beneath,
from sub- + scribere to write, Marathon, Greece, site of a
victory of Greeks over Persians in 490 B.C., the news of which
was carried to Athens by a long-distance runner.
Date: 2002
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After the first email, it was a total unsubscribathon
unsubscribathon by listmaint April 1, 2003