Definitions from Wiktionary (flatty)

▸ noun:  (regional, slang) A flatfish.
▸ noun:  (Australia, slang) A flathead (fish).
▸ noun:  (slang) A flat tire/tyre.
▸ noun:  (archaic, US, slang) A policeman.
▸ noun:  (slang) A flathead V8 engine.
▸ noun:  (slang) A hot rod fitted with a flathead V8 engine.
▸ noun:  (slang) Alternative form of flattie (“operator of crooking gambling operation”) [(informal arachnology) A flattie spider, generally in the family Selenopidae, so called because of its flattened, sprawling shape.]

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