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.

Referring to women who are sexually or romantically attracted to other women. Applies to both lesbians and bisexual women, as it is only the same-sex attraction that matters, not any other attractions the women may have.

Originates from the Greek poet Sappho, a bisexual woman from the Isle of Lesbos, from which we get the term lesbian.

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

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.

making out with somebody's 2cm flesh tunnel.