You are well off the track and suggest that you google cockney rhyming slang.
Being from Sarfend wiv cockney connections Septic comes from Septic tank rhymes wiv Yank.
Similarly horse means tart (& cart)
Apples means stairs.
and good old Bob is a Yank singer and golfer
Nowt to do with racist - perhaps you should look up your history as I believe that there were a lot of British religious groups and deportees that founded your brave land.