an awkward simple rustic person (esp in the phrase country bumpkin)
[C16 (perhaps originally applied to Dutchmen): perhaps from Dutch boomken small tree, or from Middle Dutch boomekijn small barrel, alluding to a short or squat person]
"awkward country fellow," 1560s, probably from M.Du. bommekijn "little barrel," dim. of boom "tree." Apparently, though itself Dutch, it began as a derogatory reference to Dutch people as short and dumpy.