Top Definition
When attempting to ejaculate, but instead urinate upon yourself
Dude, last night, I was masturbating, and I thought I was about to ejaculate, but instead I peed everywhere.

I love ironsiding.

Hey Alexa, do you like it when guys ironside on you?
by uaintfuk December 17, 2013

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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