Dome-sack v. The process, usually in gaming, of getting a headshot on someone and places your testicals on their face. This phrase has made its way into everyday slang to also mean to completely dominate/embarrass to an audience.
"Dude I just domesacked that dude halfway across the map with my M416!" or "I just domesacked you on that physics problem"
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.