http://en.wiktionary.org/wiki/sook
Etymology 1
[edit] Noun
Singular
sook
Plural
sooks
sook (plural sooks)
1. (slang, Australia, Newfoundland, New Zealand) A moaner, complainer, or person refusing to see the mirth in a joke made at their expense.
Don't be such a sook.
2. (slang, Australia, Newfoundland, New Zealand) A sulk or complaint.
I was so upset that I went home and had a sook about it