When you go in flaccid and expand inside.
My man's went Antman on my ass last night.
by AntmanThiccman March 20, 2019
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A person who is Half Man, Half Ant.
AntmanMike
by AntmanMike July 23, 2003
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When one penetrates an asshole soft, then expanding once inside the orifice.
Bro. I antmanned my girl last night.

Dude, what’s that?

When one penetrates an asshole soft, then expanding once inside the orifice.
by bbbbbbbbbitch March 31, 2019
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Inserting the flaccid penis into the anus of another person then proceed by getting erect.
You: Babe I wanna try anal
Girl: No I'm scared it's gonna hurt.
You: can we try the AntMan
Girlfriend: Is it gonna hurt ?
You: I'll be flaccid
Girlfriend: Okay !
seconds later
Girlfriend: OW BABE I THOUGHT YOU WERE FLACCID !
You: Doesn't AntMan get bigger though ??
by therealantman April 11, 2019
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The act of inserting an unerect penis into the anal cavity as it gradually increases in size.
Hey babe, let’s try antmanning tonight.
by TheIrishPuma759 March 24, 2019
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Verb - the act of putting a flaccid penis in a girl before getting erect, therefore expanding inside her like Antman.
I had trouble getting it up last night. I got stuck Antmanning it.
by DanMckeoff August 20, 2018
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