Poohing

Simply doing what Winnie-the-Pooh does. Originated in The House at Pooh Corner by A.A. Milne.

And a Pooh is simply poohing in the sun.

Winnie-the-Pooh

The original Winnie-the-Pooh, NOT the Disney one. He wears no clothes and is a light yellow.

Winnie-the-Pooh likes to eat hunny.

ther

A way of showing male gender, on a normally female name. Originated in Winnie-the-Pooh.

But I thought he was a boy?
So did I.
Then you can't call him Winnie.
But you said--
He's Winnie-ther-Pooh, don't you know what 'ther' means?
Ah yes, now I do.