Originally a mispronunciation of "Cream of Mushroom" soup, when it was prounounced "Queem of Mustard" by a waitress at The El Dorado Diner in Tarrytown, NY. It has no real meaning besides how funny it sounds.
There is an alternate spelling, "Queem of Muffturd," which is a conglomeration of many other words such as cream, queef, muff, and turd.
"Yes, I'll have the Queem of Mufftard in a bowl, please."
"Dude, my girlfriend totally busted out with some Queem of Muffturd last night in bed. It was disgusting; it took me hours to clean up."
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.