Definition of cheeser in English:

cheeser

noun

Irish
informal
  • The hard, shiny dark brown nut of a horse chestnut tree, typically one with a flat edge, used in the children's game of conkers.

    ‘they collected their cheesers in the spacious garden’
    • ‘They must be large and round: cheesers, or flat-topped conkers, are no use.’
    • ‘We'd head out to the big chestnut trees on the outskirts of the town and spend hours shaking the ripe cheesers.’
    • ‘It's October, the month when small boys' minds are filled with ‘cheesers’.’
    • ‘There's more fun to be had with a wedge-shaped cheeser, especially when it's been thoughtfully prepared.’
    • ‘This one tree still has the best cheesers.’

Origin

Early 20th century: of uncertain origin; possibly from the odour of an opened chestnut, or perhaps from an abbreviation of a pronunciation of chestnut.

Pronunciation

cheeser

/ˈtʃiːzə/