hit and leave

meaning you are going to fuck a girl and then leave her.

homeboy: "aye u gon' get her pregnant?"
fuckboy: "nahhh imma hit and leave"

hit the poon and leave real soon

Similar to "Pump and dump" or "Ejaculate and Evacuate". It refers to having sexual intercourse with a woman then leaving immediately after.

"Yo fam last night was dabbin! I was in bed with Caitlin but the cops showed up to the party so I had to hit the poon and leave real soon, you feel?"
"Thats CRAZY!"