Top Definition
An event that sucks as much as an atom bomb exploding above a medium sized japanese town.
Guy 1 : Dude, as if Hitler killed that many Jews.
Guy 2 : I know man, that's hiroshious!

Guy 1 : I fucked this bitch last night.
Guy 2 : How was it?
Guy 1 : She was hiroshious in bed!
by dr-rapeface July 13, 2011
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