cutch

/K AH1 CH/
noun
  1. 1

    Empty oyster shells and other substances laid down on oyster grounds to furnish points for the attachment of the spawn of the oyster.

  2. 2

    Young or seed oysters together with the shells and other objects to which they are usually attached.

  3. 3

    Rubbish; debris; refuse.

noun
  1. 1

    A preservative, made from catechu gum boiled in water, used to prolong the life of a sail or net

Source: https://en.wiktionary.org/wiki/cultch, https://en.wiktionary.org/wiki/cutch