eighteenth base

Sticking your middle toe in the tip of a guy's penis while playing with his balls with your other foot

Chad: Hey, Jakob, I heard you got pretty far last night!
Jakob: Yeah me and Sadie got to eighteenth base last night! It was fucking magical

by Baddyfuckdaddy February 01, 2017

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april eighteenth

On April eighteenth every girlfriend or wife has to give it up. Similar to Valentine's day.

by HarryCaStle June 07, 2016

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When you become a legal adult and you can make your own decisions but your parents or any one older than you thinks you are still a child.

"It's her eighteenth birthday so she's going to get a tattoo."
"She thinks she's so grown because its her eighteenth birthday."

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When one wants to stay sober for a given period of time

nah man, im eighteenth amendmenting for the night

by Posterboy69 April 21, 2010

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