The entering of one object into another, usually through some sort of semi-permeable membrane/skin/defense/covering.

See also:
1. Sexual penetration
2. Warfare penetration
3. Market penetration
4. Basketball penetration
5. Magical penetration
The addict will sometimes penetrate his arm with a syringe to inject drugs directly into his blood stream. This method of delivery is said to produce a more efficient high.
by Erinski Easy December 11, 2008
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The entering of some object into a females vagina or anus. or a mans anus. generaly considered to be a good thing.
"I penetrated that fag's arse with a rake."
by Penetration Man! October 10, 2006
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You get a good fuck when you penetrate.
It is much better than the woman giving you a hand job.
The sexspecialist grips tightly when I penetrate her
by St. Ias October 19, 2005
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An object that penetrates (you all know what it will penetrate). It can be anything, ranging from a toy to a full-size *****. However, if the object is too large, it can not be considered a penetrator, since penetration achieved with such object will be painful. Usually made of rubber or protein.
Dafaq, why do you need a penetrator when you have a boyfriend??!!!
by QWERTY mnbvcxz January 3, 2018
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The sexual inserting of a dick into a pussy
Crieg: Hey what’s about your “grocery shopping” yesterday

Chad: Oh I was penetrating Katie

Crieg: Tell me what happened

Chad: Ok, so I was at a public building with Katie, and then She came running after me. And I’m like what are you doing. She said I wanted to be with you. I said I wanted you to come. She said why, and I kissed her. I tried to kiss her twice, but then she grabbed my hand and we started to make out sexually. She pulled up my shirt, unzipped my pants. And pulled them down. Everyone started to watch. I ripped of her skirt ,pants, and shirt and she started to lick my penis.After a while, we switched,I entered my penis into her vajina and she started to moan and begged for more so I pushed her against the wall gave each other devilish smiles, and she begged and moaned for me to penetrate harder
Crieg: Oh cool by the way, I also penetrated kiersten yesterday

Chad: Was it as sexy as mine
Crieg: Way more sexy than yours

Chad: Shut the FUCK up
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When you stick your 7 ft. long <==============3 in her pussy

Alternately

When you stick your 7 ft. long <==============3 in her booty hole
''Dude, I penetrated the HELL out of Stefanie last night.''
''Oh bro, that's cool! Did you put it in her pussy or booty hole?''
''Her botty hole of course!''
''Nice bro''
by JusASmolTownGorl November 3, 2018
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