What does what it do mean?

Answer 1

To do it is to have sex. There are many different ways of saying this, but this is one of the least offensive. And no, assuming that the inquirer is too young for this, I will not delve into the specifics of "doing it".

Answer 2

"Doing anal" is anal intercourse: inserting a penis into the partner's anus. Anal intercourse is a common form of Birth Control in many cultures, offering sexual intimacy with no danger of pregnancy. It works because the anus, like the genital area, has lots of nerve endings that like to be stimulated. Since the anus does not produce natural lubricant, however, artificial lubricant needs to be used.

It is still possible to get a sexually transmitted disease (STD) through anal intercourse.

Answer 3

Say when people are getting together having some adult drinks, and no one has cracked open the bottle of liquor, if someone yells "do it up" then you best be cracking the bottle open and getting out the shot glasses!

Answer 4

Apparently it is supposed to mean "What does it do?" or maybe "What did it do?" but it is very poor grammar.