it's a slang word for a male's ding dong. Comedian Bill Cosby used it on a comedy sketch on his "For Adults Only" comedy album.
Bill Cosby describes going down a hallway to go to the bathroom in the middle of the night nude and his daughter sees him like this, with his cock hanging down. She says, "Awwwwwwwwwwwwwww. Daddy's got a wally wally."
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