The act of vigorously rubbing one's penis in an
up and down fashion either between the breasts, or the buttocks, of a woman. This activity is often accompanied by cries of jubilation and triumph in order to further stimulate and
encourage the woman to prepare herself for
sexual congress.
"Man, I gave her such a solid north-southing
last night. I ran those
knockers right through."
"Dude, look how tight her ass is. Would
love to give that an ole north-southing."