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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
eighteenth base by Baddyfuckdaddy February 1, 2017

april eighteenth 

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

eighteenth amendmenting 

When one wants to stay sober for a given period of time
nah man, im eighteenth amendmenting for the night

eighteenth birthday 

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."

Eighteenth Birthday 

The age at which a girl is just old enough to have sex with an older man without him becoming a registered sex offender.
"Hey, its my eighteenth birthday! Now I can hook up with DILFS!"
Eighteenth Birthday by dilflover67 September 19, 2025