A rare form of puberty, that instead causes bird-like attributes such as feathers. It can also sometimes result in changes in eye or freckle color, changes in size, or the sudden appearance of electrical powers.
"Birbity is a perfectly natural thing... kind of..."
"People rarely go through birbity."
A female that dedicates 6-8 weeks every Spring to restoring a bikini ready bod; which may include juice fasts, professional massages, minor plastic surgery enhancements, vitamin supplements, airbrush tans, and grueling workouts with Ken, her personal trainer.
If you can afford it, I recommend barbifying every spring and wearing a minimum SPF 15 at the beach to preserve your youthful appearance for years to come. Avoid tanning beds, smoking, drugs, junk food and other such premature agers, as much as possible throughout the year.