half base 

In a sexual relationship, half vase is when partners hold hands and hug on a regular basis.

BRUH? Did you guys get to first base yet?

Nah man, only half base?

half base by Big fave November 1, 2017

First and a half Base 

Under the shirt, bra still on. Often followed by a slap to the face and a lonely night of masturbation.

She had such a nice rack, but I only got to first and a half base, so I had to spend the rest of the night with me and my monkey.

First and a half Base by Anonymous March 16, 2003

First and a half base 

Getting sideboob but not the whole boob during a hookup for just feeling a girl up.

Guy one: How far did you get with her?
Guy two: First and a half base!
Guy one: Wha?
Guy two: Ya know, getting just the sideboob!

First and a half base by NoodlingAround January 18, 2013