It is when a girl is having sex and keeps quacking like a baby duck. Then her sex partner eats food and regurgitates the food into the girls mouth or pussy or bum. If it is in the bum they shit it out into sex partners mouth. If in the mouth they eat it. If in the pussy the sex partner licks it out.
Turds of wisdom extruded by members of the medical profession, who drink like fish and smoke like chimneys. Do as I say not as I do.
The doc told me not to drink[ and [smoke so much, but that's just quacktalk. I told him it was purely medicinal, and he said nothing but seemed to understand.