Where did this term "chunk" come from?

Ok ....personal pet peeve. It's always been a chuck and I started seeing people refer to a removable third member as a chunk.
Where did this come from? WTF is a chunk? I've always thought that people were just misinformed but now it seems like chunk is ok. It's a chuck no?
Destroyed into chunks.....

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One probably landed on somebody's foot one time and they said "Oww what a effin CHUNK!"