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"fellow," 1851, London slang, of unknown origin, perhaps from Celtic ploc "large, stubborn person;" another suggestion is Romany (Gypsy) and Hindi loke "a man."
A man; fellow; guy •Chiefly British use: Look at the bloke ridin'
[mid-1800s+; perhaps fr Celtic ploc, ''large stubborn person'']
[narcotics 1970s+; probably echoic blow]