Adjective used to describe people, typically but not necessarily female, who are both overweight and promiscuous. A portmanteau of the words slutty and pudgy.
Similar to Slimy in the sense that it is used to describe a male who tries to become 'good friends' with other people'sgirlfriends, however in a Sludgy case, the girls themselves realise that he has more slimy intentions, whereas slimy guys manage to avoid the detection of their victims.
boy1) Pete is so slimy man...
boy2) nah hes actually so slimy he's sludgy - even she can tell.
Person one: I just got back from the gas station with my sludgy Joe. I had them make it extra sludgy for me.
Person two: He’ll Yeah! Time to fix these planes!