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slang shortening of grotesque, it had a brief vogue 1964 as part of the argot popularized by The Beatles in "A Hard Day's Night." It unconsciously echoes Middle English groti "muddy, slimy," from Old English grotig "earthy," from grot "particle."
: the introspective hedonism and political individualism of the second group, called groddies
[mid-1960s+ Teenagers; fr grotesque; popularized by the Beatles in the 1960s; perhaps fr Merseyside dialect]