A Barber's Cat

Seldom used nowadays and of obscure origin, it is generally defined as one with an overly exaggerated opinion of one's own importance and/or knowledge.

"Adolph Hitler, when you really think about it, was little more than the ultimate example of a barber's cat."

Farting like a barbers cat

Made up shite insisted on by my father and uncle and made up by my grandad

“You’re farting like a barbers cat”

“Dad that doesnt make any sense you just made it up”

Farting like the Barber's Cat

Breaking wind repeatedly and noisily.

Father's triple portion of baked beans washed down with half a crate of Mexican beer resulted in a terrific 'trumpet involuntary', and Mother complained that he was farting like the Barber's Cat.

Blown out like a barbers cat

meaning., gorged , stuffed or full of food

I'm blown out like a barbers cat ...