To "shlump" is to dress informally, in a relaxed, casual manner.
Jake looked totally shlumpy in his sweat pants.
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A shlumpy PL. Shlumperts are very cool but have plump cheeks.
The shlumperts were walking down the street popping HUGE boners.
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Catchphrase when a couple is caught lacking in public
"Shlumpyyyyyy hahahaha"
Just a sort of shlump there is no way to define just shlump