[DamnthatDavid]

I thought it was self explanatory.

"I'm still waiting for my Pirate Ninja"

That indicates I am waiting, perhaps for a drawing? What type of drawing is he waiting for? Perhaps a Pirate Ninja? Well, we could go out on a branch and guess that Supa had at one point said he will draw a Pirate Ninja for David.
NO WAY!!! NO one would get that inside reference, not in a billion trillion years!!!

Maybe you can catch this one.

"I live under the Gym."

Now, if you can work this one out, I'll be impressed.