To 'Schleipman' is someone completely unaware of there actions who shake the urine out of one's penis so violently at a open urinal that everyone else in the mens room gets very uncomfortable, avoids eye contact and believes the offender is committing public masterbation.
"Hey man, Did you see Sir Spanks a Lot having a jack attack while we were washing our hands? "
"Dude. Whoa, That Cock Knocker' pulled a Schleipman and it scared the bejesus out of me!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"