The Collaborative International Dictionary
Slubberdegullion \Slub"ber*de*gul`lion\, n. [Slubber + Prov. E. gullion a wretch.] A mean, dirty wretch. [Low]
Douglas Harper's Etymology Dictionary
"a slobbering or dirty fellow, a worthless sloven," 1610s, from slubber "to daub, smear; behave carelessly or negligently" (1520s), probably from Dutch or Low German (compare slobber (v.)). Second element appears to be an attempt to imitate French; or perhaps it is French, related to Old French goalon "a sloven." Century Dictionary speculates the -de- means "insignificant" or else is from hobbledehoy.
Wiktionary
n. 1 A filthy, slobbering person; a sloven, a villain, a fiend, a louse. 2 A worthless person. 3 A drunk or alcoholic person.
Usage examples of "slubberdegullion".
I am often amazed that reputable firms, anxious to sell their products, will permit underbred, impudent, discreditable, rascally slubberdegullions to go from house to house, losing friends and alienating people from them.
In my reckoning boys range from Good Boys -- that is, boys who can pass the Towers without upsetting garbage cans and throwing rubbish on the lawn -- to the lowest dregs of humanity, depraved slubberdegullions who do the above things, and worse.