Definition & Meaning of "sook"in English

What does "sook" mean in Atlantic Canadian slang?

It is used in Atlantic Canada (especially Nova Scotia, Prince Edward Island, and New Brunswick) and also in parts of Scottish Canadian communities to describe a person who is overly sensitive, whiny, or prone to complaining, similar to "crybaby." People typically say "Don't be such a sook" or "She's a real sook when she doesn't get her way." The term originated in Scots language and was preserved in Maritime Canadian English, and remains a common mild insult or teasing term in the region.