Posted by TheFallen on March 28, 2003

In Reply to: At a boy posted by Luc Balemans on March 28, 2003

: Any suggestion as to the origin of the idiom 'At a boy'?

I've seen this exclamation, which expresses admiration or encouragement, more usually written as "attaboy". I'm pretty sure it's a corruption of "that's my boy!"