Top Definition
1. The word used to describe the sounds that a penis makes.
2. Word invented by the mysterious Robespierre during the first GD movie night.
3. The title of a CD that will be released in the future.
4. User name of the only certified cool-point distributor on Gaiaonline.com
1. I'm writing a sexy story. What's an onomatopenis that I can use?
2. "No, call your CD Onomatopenis."
3."Okay, fine. If I ever release a CD, I'm going to call it Onomatopenis."
4. "Onomatopenis, everyone only loves you because of your username, but that's okay, because it's amazing."
by Onomanomona August 18, 2009

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