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1.
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 02, 2004
237 96
 
2.
When you get past fourth base on a chick, (or on a guy if your queer). This is when you place your meat in her ass. Commonley refered to as Puerto Rican style.
Hey TJ, I fith based this chick on saturday night, Puerto Rican style. I pulled out and there was a peice of corn on my helmut.
by Kelly June 03, 2003
322 198
 
3.
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 01, 2006
267 155
 
4.
The act of propping open a woman's anus with a metal ring and placing one's testicles in her. Remove the ring and the testicles will be trapped inside her until the women releases her sphincter and passes stool. The act of the woman shitting one's testicles out is called "fifth base".
My girlfriend wanted a little more than anal sex last night so i decided to take her to fifth base. The ring hurt her but not as much as her ass hurt me!
by verticle;:) October 21, 2010
150 88
 
5.
No one knows for sure, but it involves a telephone, tebasco sauce and the anus
Watch out or you will get fifth based
by Bangdar May 17, 2007
100 171
 
6.
The true test of a relationship. It is when a male and a female truly love each other--through marriage, pregnancy, children and everlasting happiness. Sure, it may be cool and stuff to go for the milk instead of buying the cow, but you won't be saying that when your temporary slutty partner begins to hate you.
Lifeless dumbass who is too insecure to use a spoon or watch the movie Titanic: Awww man. All that work I did to get to a home run and now I have to start over. I envy all the nice guys and girls actually able to sustain a relationship :(
by VGerX2001 September 04, 2004
63 267