The feeling you get in your pants when you see you Zach Braff on tv/in a movie.
"When I realized that the new season of scrubs was premiering tonight, I totally zachbraffgasm-ed."
"Garden State was so good I totally zachbraffgasm-ed."
"If I see a re-run of scrubs on tv, I just zachbraffgasm."
The guy who wrote "Ode to Zach Braff" totally knows what a zachbraffgasm is.