It means that something is popular or successful.
Example: "I seemed to hit it off with the onion dip. I brought a gallon of it and it was gone in the first twenty minutes, and nearly everyone asked for the recipe."
"Carol was nervous about her first date, but once Bill arrived, they hit it off with each other right away."
Either that or you've really pissed him off.
# # # # # # ===Hitting it off===
youre out from hitting
Well it could mean many things. In baseball hitting is called connecting the ball with your bat. In football it means to tackle a player. Hitting could also mean a punch.
When you start hitting
If by "hitting" you mean literally hitting, then no. You cannot get pregnant from someone hitting you. If "hitting" is meant as a slang term for sexual intercourse...then via anal penetration, no. Via vaginal penetration, yes, you can get pregnant.
Position
good luck
It means someone has a crush on you and likes you.
It means they had sex.
Just because it has 100 accuracy doesn't mean it has a 100% chance of hitting.
the wind is hitting the sea and the fumes are coming off it