Yolo:  You only live once.  Said before doing something dangerous or after doing something stupid. Used to be a cool expression, now possibly is considered annoying.

Rickrolling: The prank of hiding a 1987 video of one-hit wonder Rick Astley singing “Never Gonna Give You Up” behind a seemingly interesting link.

Photo-bombing: Waiting until just before a smartphone picture is snapped and putting yourself in the picture with a goofy face.

SMH: Shaking my head.  A term of admonishment.

OTP: One true pair. A match made in heaven. Can be two real people, two fictional people, a person and a favorite object, or any combination.

Shipping:  Putting two people or a person and a thing together to make OTP. E.g. “I’m shipping Gary and Jen – OTP” or “I ship me and chocolate…”