1. The underside of the tip of a penis. sometimes concealed by skin if the owner of the helmet is uncircumcised.
Man that slut was licking all over my darth vader helmet.
When someone tells you a lie, you are being filled full of shit
"I've got a 12 inch dick
"Hey man, don't fill me full of shit."
© 1999-2015 Urban Dictionary ®
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