Belly buster

n.

An absolutely massive blackberry. Also Billy buster.

In use

Jaynee mack boy, doze Belly Busters ye haves are ginormous so dey are... did you find a den of 'em or suhim?

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Hello, dear heart. Would you like me to translate 'Belly buster' in use for you?

Goodness gracious, those blackberries of yours are positively gigantic! Did you happen upon a whole patch of them?