Whew! None of my stuff made the list (yet).
Let's see--I think it's a tie between "Juanita Banana" by The Peels, and that stupid song to which they do the "Crazy Signs" arm-dance at every Club Med (a good reason not to vacation there even if it were affordable). In fact, it may well be the inspiration for the notorious "Macarena." And until one of those hairy little bastards crashed through my den ceiling last spring, "The Raccoon Song" by Jan Hobson was nearly tolerable. (Can you tell I'm not a big fan of hand-gesture songs written for grownups? Speaking of hand gestures, "I'm gonna sit right down and give someone The Finger....and make believe it's aimed at you...." Best I could come up with on short notice).
And by "The Birdie Song," I certainly hope you don't mean Howard Harrison's "The Reincarnation Song," often mistitled as "I'm a Birdie" (its first line). I think it's wonderfully demented.