Top Definition
When a young male is masturbating in what he thinks is complete solitude and someone walks in. This surprise is enough to make the young male so flabbergasted he ejaculates all over the person surprising him.
Guy 1: Last night sucked.

Guy 2: Why?

Guy 1: My mom walked in on me and I Flabberjaculated on her.

Guy 2: I killed my grandma the same way.
by Znasty October 22, 2009
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