Used to describe an intimidating female. A Kaybaybay is characterized by her blonde hair and above-average height. She also looks like a real life Barbie. If approached by a Kaybaybay, you must move your eyes up and make eye contact, as a man of normal height is eye-level with her breasts and the Kaybaybay's male counterpart may attack if he sees you staring.
Josh: *laying on the ground* Dude, why did he just hit me!
Kevin: Because you were staring at his Kaybaybay's rack man!
Josh: It's not my fault I'm 5'6, it hurts my neck to look her in the eye!!