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1.
Someone who transmits craziness and insanity wherever they go.

Noun

A portmanteau of psycho and transmitter.
1. Unbelievable! We were all having a great time but then Kevin got here and within 10 minutes everybody was pissed off and screaming. 2. The guy’s a fucking psychotransmitter.
by Bigfreedog July 20, 2011