When having intercourse with a female, doggie style, the male flaps his arms, caws vigorously in a bird-like fashion, proceeds to break hand flap and deliver single hand strike to right buttock, followed by equivocal strike to left buttock. Upon completion, male disengages, announcing "DOUBLE BIRD STRIKE!" Shortly thereafter, male climaxes upon the female's posterior, exclaiming "SPLASH DOWN."
Starting with 2 fists palms down, extend both middle fingers and rotate both fists inward until palms are facing upward. End with a snappy, short, punching motion. Usually performed best after having slammed your bedroom door in your parents’ faces.
When Mom said I couldn’t go to Gina’s house because her perv brother wants to get in my pants, she got the rotating double bird. I’m a slut, Mom! Deal with it!
Common:
The act of giving somone "the finger" by extending your middle and ring finger of either/both hands in rage. Gives the appearance that you have two middle fingers on the same hand.
Often called Flipping the Nixon (telated to Nixon flipping the peace sign overseas which is the same as flipping someone off, also because the formation almost appears to look like your flipping a peace sign).