to slide one's ass means to hit them in an unpleasant manner by grabbing the opponent's hair then throwing several blows upon blows to their face causing them to maneuver back or in other words slide.
Using someone who has wronged you in the past usually while you're deciding if it's worth keeping the relationship or not. It could also mean going behind someone's back or getting back at someone for something they did wrong.
To "slime out" is to BRUTALLY gang-bang or beat someone up. This happens most commonly in "YN's" which are a split in the evolutionary chain from normal humans. These "YN's" will usually "slime you out" in alleyways and other parts of city outskirts. This term is usually used in middle schools when another person FUCKING ANNOYS THE SHIT out of the first person.
Bob: "Guess what?"
Jim: "What?"
Bob: "CHICKEN BUTT!"
Jim: "...Watch out bro. You ain't finna see the FUCKING LIGHT OF DAY EVER AGAIN when I SLIME YOU OUT YOU FUCKING LITTLE PRICK ASSHOLE."
Bob: "..."