Every Friends Joke

Is "I'm rubber, you're glue" some sort of popular saying? Ross, Chandler and Joey are off to watch a hockey game. There Ross catches a puck not with his hands, but with his nose. An injury and a gift! After Ross gets his nose fixed he goes back to the hospital's lobby. There Ross sees the puck in some boy's hands and demands to have his trophy back. But the kid is not ready to let go. Kid: I found it. Finders keepers, losers weepers. Ross: Oh yeah? Well, I'm rubber, you're glue, whatever— What is this string of words exactly?

Who is Dinah? And why if in the kitchen Rachel shell be specifically with Dinah? Rachel tries to remember where and when she have lost her engagement ring. Rachel: I know I had it this morning, and I know I had it when I was in the kitchen with... Chandler:  ...Dinah? Who is Dinah? Why is Rachel so obviously supposed to be in the kitchen with her?

What is Thighmaster? Chandler walks by the big window in Monica's apartment. Suddenly Chandler sees something and starts screaming. Chandler:  Ugly Naked Guy got a Thighmaster! What is Thighmaster?

What is 'doy'? And why don't you get a lot of it these days? Rachel is looking for her engagement ring around Monica's apartment. Guys are helping Rachel in her quest. Joey asks if Rachel remembers where did she have the ring on last? Phoebe feels like this is a stupid question: Phoebe:  Doy! Probably right before she lost it! Chandler:  You don't get a lot of 'doy' these days... What does doy mean? Why Chandler feels that it is out of fashion? What does doy say about Phoebe?