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11th Base 

Having Sex in the 11th dimension.

Usually involves Supergravity and M-theory. This results in having sex with your lover of choice, then ending up with your grandmother 46 years ago, then in a different galaxy, and finally you inexplicably become a tentacle monster that, for some reason, looks like a deviation of George W. Bush.

As you drift into eternity, screaming every known and unknown language, you question why you bothered to look past 4th base. You become insane.

Then you Die.

...In other words, a fun time. =D
I went to 11th base with Jenn last night.

ןoן ¿¡ʎɐs noʎ pıp ʇɐɥʍ 'ǝpnp ʞɔnɟ!!!!?!!

...What?
11th Base by Intoxicable April 23, 2011
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11th base 

Cervical sex. Side effects include: severe pain and bleeding, 80% chance of ruining baby carrying potential, and a light feeling of death. Most likely a good idea to proceed immediately to the hospital after. Note it is an absolute prerequisite to attempt sex with the Fallopian tube - the 12th and penultimate base - superseded only by wound sex, such as skull fucking.
After 3 hours of using the osmotic cervical dilator, I penetrated directly into her womb, reaching the legendary 11th base.
11th base by limitbreaker9000 February 2, 2019

11th base 

Girl 1: oo i got up to 11th base last night!
Girl 2: wow! what was it like?
girl 1: warm and wet
11th base by Hana rose May 18, 2006

11th base 

When you dig up a dead body and fuck it while shocking it with a defibrillator.
Man 1: got to 11th base with my great grandma last night.
Man 2: cool.
11th base by THOTERMINATOR July 23, 2020