the art of getting your dick sucked while your girlfriends head is submerged under water. i.e.-pool,river,hot tub, or while puking over a toilet. mainly in the south.
man i was at my cousins house, she was so drunk she gave me a sick duck.
another way to say suck dick
Chris, "I got Tiffany to sick duck"
Mars, "Damn fool! You are so dyslectic! How was it?"