Green’s Dictionary of Slang

(orig. Aus.) sheepskin boots or slippers.

1951		Malta Central Office of Statistics Trade of the Maltese Islands 🌐 Boots and shoes made wholly or partly of leather : ugh boots.
1980		Surfer 94: [advert] Australian Sheepskin Ugg Boots by Country Leather of Western Australia $50.00.
1996		Penguin Bk of More Aus. Jokes 287: Trimmed the top of your ugg boots.
2005		K. Lette Stitch in Time 197: I can’t believe I’m getting criticism on my appearance from a man wearing Ugh boots.
2006		Gee & Haynes Sheep’s Misc. 44: In the 1960s the style of boot was adopted by surfers [...] and although since that time many non-surfing Australians have taken up the ugg boot for comfort and warmth the phenomenon was largely confined within the nation’s borders. Until the 1990s, that is, when Pamela Anderson began sporting a pair on the set of Baywatch.
2007		P. Sterling Buggerum Intrigue 7: I climbed between and over outstretched bodies clad in mini-kilts and ug-boots.
2008		J. Marsden While I Live 131: Lee bought me a pair of uggies.