Up!

Below is a conversation that Mason and I had today:

Mason: Up, up, up.
Mom: You want up?
Narrative: I pick Mason up and he immediately wants down. Clearly, Mason did not intend for 'up' to be defined as 'pick me up'. I put him back down and Mason walks off and says...
Mason: Up.... Up... Up...
Mom: What do you mean?
Mason: Up, up.
Mom: Up?
Mason: Up... up... up...
Mom: I don't understand.
Mason: Up.

I will report back as soon as I figure out what 'up' means.