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2.
When someone that has a large belly is wearing a shirt that is too tight or too short, and their belly sticks out- like Winnie the Pooh's.
"George sure is Winnie the Poohing today, isn't he?"

This shirt is too tight & short- I've been Winnie the Poohing all day long!
by Satchel May 06, 2005
 
1.
The act of walking around with a t-shirt and nothing else on, like Winnie the Pooh.
My roommates stopped paying the rent and moved out when they walked in on me Winnie the poohing.
by Alex N. aka alexsexyman June 26, 2011