"dandyish," 1782, from buck (n.1) in the slang sense + -ish. Earlier it meant "like a he-goat, foul-smelling, lascivious" (1510s). Related: Buckishly; buckishness.
buckboard
bucket
buckeye
buckhorn
Buckinghamshire
buckish
buckle
buckler
bucko
buckra
buckram