fifth base

The only base you can slide into where you KNOW you'll get your pants muddy.

Brian: How far'd ya get with her?

Mike: Fifth base!

Brian: Really?

Mike: Yeah, this mourning I totally had to wash the uniform.

by Brian_is_tasty July 1, 2006

1st Base

To french kiss.kiss

I finally got to first base with my boyfriend

by Someone August 12, 2004

12th base

When your girlfriend removes her glass eye and you prodceed to insert your penis inside the hole and fuck her.

Guy 1: "Dude we got to 12th base I don't deserve to live anymore."
Guy 2: "shit bro I'll get my bat."

by Shaniquaobamaniqua September 17, 2013

Sexting Bases

The metaphor generally applied to sex using baseball, except towards all things sexting. The bases being:
1st: simple flirting
2nd: a wink
Short-stop: Blatant sexual innuendos

3rd: sexting
Home: photos

*important note: the sexting bases are almost always cumulative and in the same text themselves.

At first it was just simple flirting, then things progressed and we ended up rounding all the sexting bases; thank you picture phone.

by Troyciferous Rex July 20, 2011

59th base

Getting it on with an extra horny Megan Fox.

My life goal is completed after the 59th base.

by Endeavor19 July 5, 2009

tenth base

To fake an orgasm by splashing previously created and preserved semen onto your partner.

"I had to pee so bad, so i reached into the nightstand and pulled out the vile of semen I keep- just in case. Moaned a little and splashed it on her... First time I ever got to tenth base"

by Tim Gruich October 6, 2008

3rd base

oral sex, usally closely followed by intercourse

i got to 3rd base with your girl last night

by unknown April 3, 2004