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This is when you're in the 69 and rip a monstrous fart directly up the nasal passages of your partner.
She nearly choked when he delivered a flabbergaster during their first 69.
by Disco Misfit September 20, 2006
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(Single)An old dude who scares the shit out of people.

(Plural)A convention of hobos who bring liquor stores lots of change

The flabbergaster jumped out of the alley and scared the shit out of Toby.
by Sherpent October 21, 2008
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