Belly buster
Featured in The Déise Dictionary
An absolutely massive blackberry. Also Billy buster.
Jaynee mack boy, doze Belly Busters ye haves are ginormous so dey are... did you find a den of 'em or suhim?

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?
Any good?