Definition of "boyo"
boyo
/bɔɪ.əʊ/
noun
plural boyos
(sometimes derogatory) A stereotypically Welsh form of address for a man, usually younger than the speaker.
Quotations
A taff is a Welshman. Everyone in the doctors’ mess calls me taff or taffy. Mr Swain, the mortuary attendant, calls me boyo, especially during the rugby season when Wales lose badly.
1995, Peter Ho Davies, “The Ugliest House in the World”, in The Ugliest House in the World: Stories, Houghton Mifflin Harcourt, published 2003, page 4