Anyone of complete and total ineptitude, if it involves the simplest of tasks it will be fucked up. Someone who does not have there shit together in the remotest sense
" That motherfucker is the schlumptiest schlumpty known to man, he could'nt find his ass with a GPS and a personal assistant!! "
by Cosmo Romeo August 6, 2006
Adam, a fictional character, is working in a pillow factory. A box is upturned accidently on him and pillows slide over him, after he may say this experience felt rather "schlumpty"
by MisterLieber June 30, 2006