Noun: Oh great...Titsy is coming over. Remember, keep the conversation on the Third Grade level.

or

Adjective: That chick is so Titsy, but she has a HUGE rack.

A kid in my class is a water slapper

Moe: "Yo Joe! Did you see that girl's titsies?"
Joe: "Yeah man, they were pretty bitchin'. Perky and not too nipply. Woot!"

My stalker's getting pretty titsy- She drove all the way to Seattle. That's only 1 1/2 hours away!

"Those deck lights are titsy!"