birdysit verb1 •(rare) To take care of a bird in the owner's absence; to birdsit.Hi, all. For the past 2 months, I've been birdysitting my SO's boss' red-lored amazon, and I've become rather fond of the little guy. He's wild-caught, but usually very sweet. — 1994 formsbirdysat · birdysitting · birdysits