Extremely excited;overly joyed. To have never ending happiness.
"That cheerleader over there is flabbergastic!"
"I know, she's the girl who never stops clapping!"
by Maggie SE May 12, 2007
to have an unusual urge to rape a cow. also can be said as a moo-diction.
"thats bullshit" "that makes me flabbergastic"
by punchyboy23 November 10, 2008

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