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Someone that when playing a game and loosing always suggest switching to some esoteric game that they only know the rules of.
"This game is nice, but I know a better game. Lets try to play (unknown game) instead. It's not hard, I'll explain the rules!"

"Come on, you do this every time you are loosing. Let's stick with the game we are playing. Don't be such a Sesh-head!"
by SomeoneFromPortsmouth December 05, 2017
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Someone with a short temper, quick to start verbal disputes but retreats as soon as it turns physical.
'Sesh-head' is apparently now used to refer to teachers, though in a looser sense.
by Anonymous User Person March 22, 2008
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