(Une) Pitoune is a hot chick or hottie in Québecois Jargon. It may be used as both a noun and an adjective.

Natalie? Elle est ben pitoune! (adj.)
Natalie? She's a hottie!

Natalie est une pitoune. (noun)
Natalie is a hottie.
Pitoune can only be used for girls and as hottie, it usually means "sexually attractive" as opposed to "attractive" or "cute."