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Derived as a shift to an -i adjective of older -na adjective やば(yaba, “illegal, dangerous, uneasy, not going well”), itself a slang term of uncertain derivation that appears in sources from the late 1700s.[1][2][3]
Possibly related to the ayabu- stem in 危ぶむ(ayabumu, “to fear something, to view something as dangerous”), and the ayau- stem in 危うい(ayaui, “dangerous”, ancient reading ayapui).