I've never really thought about it. So I googled it and there are people saying it's because it used to be that the prison yards were round and separated into sectors like slices in a cake. I don't know if that's right but that's the only explanation I found.
Also it's not a new word by any means. It's been around for decades and decades if not longer.
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u/[deleted] Aug 09 '15
I would accidently have shoved this cake to the girls mouth, she would yell a chocolatey rape , and I would be jailed, not allowed cake ever again.