Robin Olds recounts a similar tale from the days after the war when he served as an exchange pilot on an RAF Meteor squadron (ultimately becoming the first american to command an RAF squadron I believe).
On being instructed by a slightly plummy sounding RAF flying officer regarding the Meteor's controls, he was advised as follows regarding the engine start procedure:
"Now do you see these two things here old chap, well when you want to start an engine you just have to push one of the t!ts...."
Olds was said to be more than comfortable adopting the new abbreviated term for an "engine start push button".