1. To excel in any given area with no experience.
2. To be innately excellent at a given task without prior training or experience. Especially in regards to physical prowess.
3. To be a hard man/woman for no apparent reason.
Origin:
Originally from biology, where the belly and throat of land mammals are the main targets for predators. Some individual animals were observed to repeatedly escape attacks from predators (large
cats etc.) despite having no obvious physical advantages. Biologists joked that these individuals had “rock for bellys” and predators could not
bite into them.
Phrase has been bastardised and is
common among weightlifters and body builders. Can also occasionally be
seen in
internet forums
"Man I work out all the time, but Mark still
kicked my
ass"
"He rockbellyed you good....... bitch"
"I challenged Jenna to a match in MW2, she had never
played before. But she pwnd the shit out of me. She was a total rockbelly! "