hundreds and thousands

noun[plural only]2

1. •
   An indefinite but emphatically large number.

   • I myself have seen in Missouri, Kentucky, Tennessee, and Mississippi, hundreds and thousands of women and children fleeing from your armies and desperadoes, hungry, and with bleeding feet. — 1864
2. •
   (UK, Commonwealth) Tiny balls or strands of multicoloured sugar, sprinkled over ice cream, desserts or party foods.

   • So there you have them - Onoda, Gund, Eclipse - all squidged together on the same spoon, their flavours intermingling under a bleeding crust of hundreds-and-thousands. — 2003