When you bend your dick down and back, and a girl blows you from behind with her nose on your butt hole.
"I got a dandy Cuban Underduck from the broad I met at the bar last night."
When your boner has a sharp downward turn, ala the nose of Cedric Sneer from The Raccoons cartoon.
"My Cedric Sneer made the Cuban Underduck nice and easy for that Spunker"... (see: Cuban Underduck)
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An excessive upward bend in ones boner. Similar to a boomerang.
"My Buffalo Hook made the Cuban Underduck nearly impossible. I almost did a front flip!" (see: Cuban Underduck)