LMAO Tourette's is defined as part of a spectrum of tic disorders, most notably chronic tics. LMAO Tourettes is most often associated with the exclamation of LMAO, LMFAO, LOL, LOLZ when that response is not warranted; socially inappropriate; or a retort to derogatory remarks; or simply for the lack of a better response.
Girl: Why'd you decline my pic? wtf?
Girl: But, I'm not laughing
Girl: It was of my dead cat
Girl: you have f*ckin LMAO Tourettes or what? nouveau douche!