Australian slang for an extremely unattractive person, thong's being rubber flip flops, and you can generally imagine what they would look like if burnt.
Shit Bazza, that sheila has a face like a burnt thong.
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An insult to someone who has a ugly/burnt head, typically used in Australia to also describe aboriginals
"Ya got a head like a Burnt Thong"
"Have you seen steve"?
"Yeah mate, his one ugly cunt, got a head like a burnt thong"