As above,ie directly translated from German as "a man who urinates whilst sitting down"; refers to a man who is hen-pecked or under the thumb of his wife/girlfriend, or is otherwise weak or effeminate.
but fr, peeing standing up doesnt make u manly, loser. it makes u hygienic. plus, its way more comfy not aiming and u can use ur phone. sitzpinklers are here to stay, motherfuckers.
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?"