Is “Attaboy” a Scrabble word?
Yes
ATTABOY
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Attaboy
/ˈætəˌbɔɪ/
noun
1.A cry of "attaboy"; an accolade.
interjection
1.Used to show encouragement or approval to a boy, man, or male animal.