Origin of attaboy
Examples from the Web for attaboy
He was censured by his colleagues in the House but given an “Attaboy, Charlie!”
He did go and support the team, and enhance the glory of Zenith, by yelling "Attaboy!"Babbitt|Sinclair Lewis
In the ominous silence a cracked voice yelped: "Attaboy Fenton!"Vulcan's Workshop|Harl Vincent
It will be observed that Mr. Burke has given his attaboy a "t" too many.Pieces of Hate|Heywood Broun
1909, probably from common pronunciation of "that's the boy!" a cheer of encouragement or approval.