Who has the biggest Dong?

Some of my friends are taking finance with prof Hong Dong. So his name (Dong in particular) has inspired us to make many "dong" related jokes such as:

"I'm taking Finance under a dong"

So the other day another friend comes to us and she's like "omg i saw my fling yesterday ... its so awkard." So we asked her what defines a fling. And she said "A small thing" - so obviously being guys we automatically took it in a sexual way. Seconds later Daren started asking everyone:

"Do you have a fling or a dong?"
one response: "I have a Ding"

LOL wth.

In the end we came up with the Order of the Dongs: Fling < Ding < Dong < Schlong < Flong (foot long)