a stereo-type made from americans that think we say it all the time. But when actually used, it used to make sure the listner comprehends or is even still listening, also a short way of asking after an opinion if the listner agrees with you or not.
BOB: "americans think we say "eh" all the time did you know that eh?"
SUE: Really? like how they think we live in igloo's and ride around on dog sleds aswell?
When you are physically closer to an object, but you are too lazy to move. You use this call to indicate someone, forcing them to use their energy to retrieve the object that is physically closer to yourself.
Two persons are sitting at a table. Person A wants a coke bottle. She is 2 inches away from the bottle. Person B is a foot away from the bottle. Person A applies the action Eh. Telling Person B to get their ass up and get the bottle, even though Person B is farther away from the bottle.