What is what does hit it from the back mean?

"Hit it from the back" is a slang term primarily used in the context of sexual intercourse, specifically referring to positions where one partner penetrates the other from behind. This can include positions like doggy style, where one partner is on their hands and knees and the other penetrates them from behind. It can also refer to other positions with rear entry.

It is important to be aware that the term can sometimes carry a negative connotation, especially if used without consent or respect. As with any sexual activity, consent and clear communication are crucial.