To get someone pregnant

To impregnate a lady..

to get pregnant; an unplanned pregnancy, unwanted.

to get someone pregnant, generally unplanned.

1.When a man gets a women pregnant, usually not planned.

To get a woman pregnant, perticually un-planned, un-wanted or in wedlock.

"Knocked up" is slang for "Impregnating"

Though it is generally used negatively, in certain "ghetto" settings, it is a compliment to tell a girl her boyfriend knocked you up. No one is sure why, but many believe it is a compliment for implying that said boyfriend is attractive/sexually potent.