Well, basically this method is slow when you first start it, then you'll pick up on it.
Go on a wall and having another profile or friend right beside you, but not on the wall.
Then slide over on top of the guy and you should move over him like an object.
Keep placing your friend or profile right beside your guy and keep sliding, meanwhile the guy that's trying to glitch out of the map can't move unless there's a guy on a side of him where he can slide to or else you'll have to restart it all over again and it's pretty frustrating.
You have to do this glitch up stairs or a ramp or anything going up.
Then when you're like 3 steps away (I usually hit a solid object just in case) after getting up a ramp or stairs, etc... hit left or right (kinda hold for 2-3 seconds) on you're moving thumbstick and you'll slide back and doing this you'll be levitating.
Try this out on the river first, it's one of the simple maps to get out of.
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