The extreme attempt to carry one something that is already resolved or no one cares about. The extreme case up the idiom, "beating a dead horse".
The cocky douche bag was beating a dead horse by rubbing his victory on the loser. However, he preceeded to raping a dead horse by talking trash to the loser for the next 20 years.
If everybody thought the same, then they would all bet on the same horse, then nobody would make any money. Hence, different views make horse racing possible.
Dan: "Everyone goes home from school for the weekend to be with their mothers, its lame."
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?"