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A person who can ruin a social atmosphere just by turning up, making a poor joke or creating an awkward silence.

Idenitfy a Social Slayer by making kung fu like karate chops in mid air. This is to show that the social situation has just been slayed.
Group Of Friends:

Guy 1: this party is sick man

Guy 2: Yeah as soon as that song came on it was mad

Social Slayer: Cant wait til they play some Justin Beiber
by MGSocial Protector April 04, 2011
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