slough ass
A man or woman who has amounted to very little in life, frequently is found on couches eating chips, or napping during the day in bed.  

Can often be seen watching ESPN, or reality television, rarely has a job, and usually neglects personal hygiene like brushing their teeth in the morning, or putting on deodorant.

Diet usually consists of hot pockets, microwave burritos, taquitos, and pot stickers.
Dude, Kevin is a total slough ass.  That schmuck logged 14 hours on the couch today playing madden 2005, and then: he farted when my mom came by to drop off my mail.  What a loser.