Roommate 1: "I found an unused, extra toothbrush!"
Roommate 2: "Keep it for drunk guests who can't find their toothbrush during State Patty's weekend."
Roommate 1: "It's one of those things that would be useful if only you can find it when you need it."
Roommate 2: "Yep, it's one of those usefulless stuff..."
Something that's really really really useful. You don't know how your grandparents survived before it came along. When your one blows up over the weekend you love paying for the after-hours call out fee because you can't face another day without it.
This planet is a usefulnessity. I would die without it - or float around in space until I died.
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?"