The act of engaging in extremely gratifying sexual behavior with a professor who teaches civil war history. This may be graded.
We had a relatively normal day until I ended up at Dr. Vanilla's house earning my freedom through the undersheets railroad, it was a true emancipation penetration...and that poor dog had to watch
by missindsey February 19, 2010
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Heavily influenced by the Bangometric Pressure. Highly sophisticated survey based on probability that helps to determine the odds of tappin that ass.
Did you see that look in her eye bro? There is a 100% Chance of Penetration tonight.

I blew it when she caught me checking out her mom, now there is a 0% chance of Penetration.
by Discoinsterno November 6, 2014
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Usually done with a micro penis and your partners toes, popular with a gay man and trans male,
It’s when the micro penis penetrates under your toe nail, typically done using the big toe
You have to have long toe nails for this action.
Charles: “hey man wanna have some toe penetration sex?”

Willy: “sure! Let me get my trans micro penis out, prepare your toes Charles.”

Charles: “hmmmm~”
by DragonChickens#3205 August 18, 2020
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Nipple penetration is the act of inserting ones penis into a persons nipple (normally female).
I am saddened by the lack of nipple penetration porn on the internet.
by TurtleBoner May 12, 2015
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When a zebra gets an erection from looking at dwarven gay child porn, then that zebra breaks the pelvis of a baby blob fish.
The Zebra at the zoo was doing a Penetration Nation
by Giga N@GGI 2000 October 26, 2022
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OWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW
ANAL PENETRATION FUCKING HURTS MY ASSHOLE
by FUCK HER IN THE ASS July 30, 2015
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