The absolute worst internet THING created, second to (i shudder to type): SWAG.
Meaning You Only Live Once, it practically makes you believe you can do ANYTHING and you have the right to do everything, no matter how stupid. The people that say this practically enter derp
Tim: #Yolo I just downed 5 kegs of beer #Yolo
Frank: Yolo. You. Only. Live. Once. Don't f***ing waste it. By the way, you are a real derp
Note: These are random names.