Bastardized form of the word "mukluk" which refers to a boot made from animal skin worn by Eskimos or boots of similar fashion. Yeah, this is the word Krusty uses in that particular Simpsons episode.
Krusty: Kent, the young people today, they think comedy is dirty words. It's not -- it's words that *sound* dirty, like "mukluk."
winter boots designed in the styles of the Native North Americans. Styles that include knee hig winter boots, faux fur trimmed winter boots, everyday wear traditional style mukluks as well as the warmest winter moccasins (mukluks) in the world.
**Canadians are familiar with Native gear"
"Cool mukluks! They lookwarm...where can I get a pair?"