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1 definition by joram livengood

 
1.
i.g.t.s. is the acronym for Involuntary Groin Thrusting Syndrome (a sudden burst of humping convulsions), it is not actually involuntary but is in fact done for a good laugh in public places. best if used on random people because then you can then explain that you have a disease and get away with humping ridiculously beautiful women or you can piss off ridiculously stupid looking guys.
man: (i.g.t.s.'s his friend next to him)
random person: "dude, stop that"
man: sorry, i have i.g.t.s.
by joram livengood March 22, 2007
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