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1.
(noun): An orgasm precipitated by looking at a picture of Robert Pattinson. The obvious conclusion to robsturbation.
Oh god, I have to stop looking at all of these fuckhawt Rob Pattinson pics! I'm going to die due to robgasm!
by rpattzlawyer November 05, 2009
 
2.
it happens when you look at an extremely hot picture of robert pattinson.

or you watch him on TV.

or you by some chance come into close proximity with him.
Interviewer: So, Rob, how's the weather?

Rob: I err, ehh, I dunno...I guess it's...er...uhh *smiles and runs hand through hair*

Fangirls: *robgasm*
by saaaaarah?!?!? July 31, 2008