Fifth Base

Fifth base is fucking a girl in the asshole.

Man, that girl has an onion ass.....I hope I get to fifth base on that shit!

by Pierce Binoche September 2, 2004

8th base

Touching knee caps

Brandon: You know why she wears shorts right?
Arthur: No why?
Brandon: It's easier to get to 8th base that way.
Arthur: Her knees do look pretty sexy today.

by CooRiderOfTheNight January 9, 2011

75th base

When you turn on xbox live and stick your penis through the disc tray, your partner ther sticks their vagina the other side and you have incercourse whilst your dick is being cut on the Halo 3 disc you left in the Xbox.

Terry: Hey Sam I totally got to 75th base last night
Sam: Seariously? .. You're messed up man.

by Perak September 2, 2009

57th base

The act of fucking all ancestors and descendants of one person, all at once, attaining a level of nirvana previously unseen, except for one night October of 1929. The shock wave was so great, the stock market crashed. Lots of whipped cream must also be involved.

Dude, I got to 57th base last night, and I fucked JFK and Queen Victoria. It was insane.

by Jason "Reckless" Pavlick May 30, 2009

13th base

Sex with your boss, professor, or another person you have no business fooling around with . . .

"I did not have sexual relations with that woman . . . it was just 13th base!" -- Bill Clinton

by Scylla June 29, 2006

42nd base

While walking the side street of a largely populated city, an obese transvestite begins to engage in oral sex with his own genitals and asks you to ejaculate into his nostril. Simultaneously, your cousin sees the procedure taking place and summons her bestfriends for a group orgy along with some animals. For best orgasms, it is advised that you have a 5-some with your parents, your cousin, and her bestfriend. It is not uncommon for police officers to shoot a bullet up their anus when they see such things.

Transvestite: DUDE, watch me eat myself out while giving myself a handjob

Police officer: Can I join in and make this 42nd base?

Transvestite: No

Police officer: *shoots self in asshole*

by chaz42 March 25, 2009

72nd Base

Fucking every single guy/girl you went to school with, ensuring you do the odd number bases twice. While being filmed before posting it on a NUT website and achieving 72,000 views overnight.

Person A: - Wow, I heard Rob got to 72nd Base last night.

Person B: - Really? He didn't screw me

by After Eights April 12, 2010