Attaboy: A contraction of the expression "That's the boy." American slang used by players and lookers on at baseball matches. It became popularised in England during the later stages of the war. Mr. G. Bernard Shaw says, in describing a baseball match at which he was a spectator: "Even those players who had no gift of eloquence expressed their souls in dithryambic cries like the Greek Evoe! which sounded to me like Attaboy! I confess that I am not enough of a Greek scholar to translate Attaboy, but it is a very stimulating ejaculation." 
References / notes
- Edward Fraser and John Gibbons (1925). Soldier and Sailor Words and Phrases. Routledge, London p.11.
Glossary of words and phrases
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