(dc) what's a snook?

well, i knew it was a fish, but, according to my sister's new blog:

"5 entries found for snook.

snook2 P Pronunciation Key (snk, snk)
n.
A gesture of derision or defiance.

Idiom:
cock a snook/snoot Chiefly British
To thumb one's nose: “ [The clock] is set wrong and hung crooked, as if to cock a snook at the importance of time” (Kevin Crossley-Holland).

[Origin unknown.]"