Australia and New Zealand. a timid, cowardly person, especially a young person; crybaby.
Midland U.S. (used to summon cows from the pasture).
Origin of sook
1890-95; probably from earlier sense “calf reared by hand,” perhaps suck(-calf), with spelling representing N England, Scots pronunciation of suck (but earliest cited pronunciation of sook is (so̅o̅k))