Moffat could conceivably have Capaldi as a (now and then) furious Doctor but obviously could not have the language.

Here begins the Capaldi Who (not so) Profanisaurus...

Armholes!!!

Fffffiddlesticks!!!

Muddy field stomping MONKEY STROKERS

Continue if you like. Don't like?

Forget every elbow flapping bellisimoronic apple munching word of it!!!!

Pass.

I have been known to use 'flowertots' as a replacement for another word beginning with that letter...

Also, avoided a potentially damaging moment where I said 'darn it' in front of my infant cousin and she repeated it back to me! Luckily I had the sense not to swear-swear.

He could always reuse the swear 11 used in reference to Artie and Angie Maitland after they sneaked out to the cinema when Clara was asleep - "those little Daleks!"

(A nod to Spongebob Squarepants)

'Barnacles!' Or just a series of dolphin squeaks...

Clara: "What happened to me?"
Doctor: "We fudging time travelled, yes?!"

Doctor: "**** the fudgity out of those fudgers".

Doctor: "Fudgity hi!"