What does it mean - Percuilar ??

My mate from the US wrote me so. What does it mean percuilar? What is cooking ?

sprawdz w slowniku: peculiar

Thank you, smart madame!!

A "what's cooking" to "what's up", "what's happening" itp.

peculiar=extraordinary (osobliwy, niezwykly)
cooking=making meals

I know what it means: What's cookin' .
Believe me. It was there as a question fot the first part.
B.G.