What...

[Tulsa_Fireman]

...makes polish sausage polish?

[GottaHavePride]

Off the top of my head, it comes down to the blend of spices mixed into the ground meat.

Italian sausage (or what Americans call "Italian sausage") almost always involves fennel seeds or anise in the mix. Polish sausage uses more pepper, garlic, and caraway seed.

[JohnnyMack]

Perverts.

[Crucifax Autumn]

I'd say if the guy whipping it out is named Wojciehowicz.