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1.
A condition of emotional paralysis experienced in the days following one's viewing of "Brokeback Mountain."
Biff: "Ever since Jim saw 'Brokeback Mountain', he's been crying in his room and hanging his ex-boyfriend's shirt behind his closet door."

Doyle: "He must be suffering from brokebackitis."
by B January 13, 2006
 
2.
an unknown STD transmitted through the act of gay sex.
jim: whoa phillip, you look sick.

phillip: i feel like shit...i think you gave me brokebackitis last night.
by gar_fizzle December 27, 2007