OMG!, did you see how Brittany is like totally Breasticulating while talking with Johnny. She can wiggle those mosquito bites all she wants, cuz mine are bigger, and Johnnys like so much more into me.
Formal slang either used to describe a person or meaning "having to do with breasts". It usually implies vastness if used to describe people, but not always as the examples below show.
She is very breasticular. Her new girlfriend was a breasticular disappointment. They practised breasticular nudity at the beach. Her breasticular look made her famous fast. He enjoyed breasticular ejaculation.