When fingering your sex partner insert bird finger into the anus then remove it and flick off the world as if your on top. Your shitty bird finger is now called the dirty bird.
When a girl finishes a blow job in her mouth and pretends she has swallowed his cum and goes in for a kiss. To his surprise she instead “feeds” the guys cum back to his mouth.
Jessica finished off Ross and thought she was being so thoughtful and gave him back his semen via the mama bird surprise