From glow + boy or possibly blend of glow + cowboy.
A compound of glow + boy
Proto-Indo-European *ǵʰleh₁- ‘to shine, glow’
Middle English glouen
English glow
Proto-Indo-European *bʰā-
…
Proto-Germanic *bōjô ‘younger brother’
Proto-West Germanic *bōjō
Old English *bōia ‘boy’
Middle English boye ‘servant, commoner, knave, boy’
English boy
Today it means
noun A (male) nuclear power plant worker who repairs equipment in areas with extremely high levels of radiation.
Language periods are conventional ranges, not dates for this word.
Etymograph / glowboy
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