Acronym for "Shit You Don't Need"*
Used to pejoratively refer to anything that that can be regarded as useless, overpriced, a fad and generally all that is related to consumerism.

*Yet to be accepted by the internet community.

Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy

sydn means “suck ya dead nan” if you ever say sydn to someone from britain then will cry for days and if you say it to a chav from britain they will try stab u so best kept to yourself