Born in the call of duty series, the motherload is when a single player finds more then 3 enemy team mates all together at once. Throughout history, the motherload was a common way to describe finding a very large amount of something valuable. Motherloads are most commonly found in cod multiplayer online game types such as; team deathmatch, headquarters, domination, etc.
syco - omg dude i found the baby, that means the motherload can't be far behind!
el rey -omg there they are, there's 5 of them, i've found the motherloadddd!
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.