Can I fry I turkey in a turkey fryer pot directly on an outdoor gas bbq (not a burner with a propane tank?)

Yikes! I hate to think about how high the over flowing oil would shoot up flames!

nonononononononon!

Definitely not, IMO. Check out Weber's site. We fry on turkeys on a concrete slab away from anything & everything flammable. If you do it on the grass, most likely you will have a burnt patch afterwards.