420th base 

Having sex while smoking a blunt and imagining shrek ruinin your butthole with his giant ogry penis and tell you too "GET OUT OF MY SWAMP".

"Doctor! What happened to his ass!" "He went to 420th base"

420th base by Tomchaos January 20, 2015

400th base 

sex with your dog while eating a donut and realizing you are actualing havign a 5some with donkeys in a lagoon while a supernova is going on

i was talking with my buddies and asked if i got some and all i said was we went to 400th base =

400th base by gunther peterson March 11, 2008

40th base 

Two trains on the same track are moving towards each other, each at a speed of 40 miles per hour. On the top of one train stand 50 naked guys with boners. On the other train stand 50 naked girls who are horny. What happens to the ones that don't fall off when the two trains run into each other is called 40th base.

Damn, i just got an orgasm from 40th base....it sure was pleasureful...

40th base by gretaaaaaaaaaa August 21, 2008

40th base 

The last of all bases. To turn yourself into a transexual and then rape your best friend and mother.

A- Sorry about your asshole I just wanted to get to 40th base.

B- I understand.

40th base by ALo╛Prezidente August 11, 2008

40th base 

having your roommate walk in while jacking off to a picture of his mom, and then joining....similtaniously sticking a frozen banana up a monkeys twat.

guy one: dude awesomest thing happened last night!!!!!!
guy two: what?!
guy one: i got some serious monkey action.
guy two: no way! 40th base?!?!? well done dude!

40th base by dangletsbang September 26, 2008

40th base 

making out with somebody's 2cm flesh tunnel.

dan - duuuuuuuuude i just got to 40th base with ginny.
random stranger - you mean you kissed her 2cm stretched ear! aweeeeesome!

40th base by gintingz August 24, 2008

426th base 

Fucking Jays Mom!

Bro i just got to 426th base with jays mom!

426th base by LETRONSMASH2K17 February 8, 2017