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A person (usually an adult) who is so terribly overweight and cumbersome that you just know the mattress wont be able to take the strain and that the bed will audibly crack and then sag like a broken matchstick when the overweight person gets onto it - usually by throwing themselves backwards onto the bed.
Wow! Look at the gross size of that man - bet he's a bed-killer.
by mimbijones July 08, 2015
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