70
Being an absoloute idiot
e.g:

Stop it you flump!!!

Oh My Days stop being such a flump!
by ChatterBoxSlang November 23, 2010
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71
To fall without grace into a seated or laying position.
Don't flump down on the bed!
Or

That kid just flumped down on the couch and almost broke it.
by Kcraig115 December 18, 2016
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