When somebody is so startled or frightened that they crack a rip in their jeans. They jump so hard that they pass gas loudly and/or often times shit them self uncontrollably.
Did you guys see jimmy in class today? Amy smacked his ass and he flabber-gassed-it all over the back row during a silent study.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi