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)
Guy1: What you lookin at mate?
Guy2: You, ya Plebble
Guy1: ***commits suicide out of shame***
A person who fucks every single person they find on their ancestry.com tree without a condom. Usually used as an insult, a plobbernoodal is considered the low of the low in society and being called a plobbernoodal is typically worse than being referred to as the big gay.