(n.) One who is afraid to have an opinion, and rather, simply points out the flaws of what everyone else is saying. Dislikeable to all. The exceptions are those fence-sitters that really don't give a shit and make fun of everything, who are liked by all.
these are a very specialised group of people who are absent of any ability to make a choice in any walk of life.
they very often avoid making decisions and would much rather sit on ones fence, there it is said to be safe and free from confrontation.
if approached by large groups asking lots of questions at a fast tempo the fence sitters are often known to curl up into a ball or play dead.
chris: "hey john did u see that smogon stood over there on its own, the fuckin freak?"
john: "im saying nothing mate, i dont wanna get involved"
chris: "why have you curled up on the floor in a ball? oh yeah! your one of the fence sitters"
john: "stop asking me so many questions, i might accidently answer one"
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.