What is this "pizza" you speak of?

[Lemur]

I've heard this term elsewhere too. What's a 'dive-joint' supposed to be?

"Dive joint" or "dive" usually means an informal, unclean, lower-class kinda place. In the case of Gino's East, they take it to an interesting conclusion. Guests are encouraged to write or carve on the walls and booths, the entire place is dark with dark wood furniture and walls. So even though it presents a kinda rough look, it's actually fun. And the food is very good. So that is the sense in which I was using the term "dive joint."