A Plebble is undifinable, it is a word that is mysterious and is shrouded in controversy. Using it in an argument results in instant victory for whomever used it and ultimate shame for the other party(s)

Upside down tortoise

Someone who is a total fucking pleb

For someone who is a complete pleb

A value brand version of Fruity Pebbles. Whether it is as good or not may vary. The only thing guaranteed is the low price.