Idioms: 'at a boy (that a boy) -- 'at a girl (that a girl)

Idiom	Meaning	Example
'at a boy (that a boy)	good work, well done	Whenever I win, Don says, " 'at a boy! Good game!"
'at a girl (that a girl)	good work, well done	When Judy gets good grades, her mom says, " 'at a girl, Judy!"