LARP is a little-known entry in the DSM IV as a sub-entry under Delusional Schizophrenia. LARP is an acronym for Loser Attracting Reality Psychosis. This debilitating disease of the mind affects people (mostly males) as they reach that difficult stage at the beginning of their teenage years. It seems to often be set off by the young teenager being exposed to Computer Games which have the common theme of gameplay set in the dark or middle ages (and often in dark or middle roomsyeah, that totally makes sense). LARP can also be read out as Laughing At Retarded People.