eighth base 

Getting to fouth or home base with two women at the same time.

My wife let me get to eight base with her and her best friend.

eighth base by Lucky Larry May 13, 2004

eighth base 

Touching knee caps

Brandon: You know why she wears shorts right?
Arthur: No why?
Brandon: It's easier to get to eighth base that way.
Arthur: Her knees do look pretty sexy today.

eighth base by CooRiderOfTheNight January 9, 2011

eighth base 

When the male partner inserts his testicles into the female partner's anus with his penis simultaneously inserted into the vagina. This often creates a side effect known as "fecal testicles" which most men find discomforting.

"Dude, I totally got to eighth base last night."

"I wouldn't try eighth base because it makes your balls all shitty."

eighth base by The Douche Monkey June 18, 2014

Eighth Base 

Titties in your ass, if a woman puts her titties in your ass, you have been to eighth base.

I just went to eighth base with Jen.

Eighth Base by Bangdar June 4, 2007

Eighth Base 

Helping a girl deliver her baby.

Spawn camping milf hunters often try to go straight to Eighth Base with a pregnant girl on the first date.

Eighth Base by rip-torn February 12, 2022