Green’s Dictionary of Slang

1. a term used to refer to physical effort, mechanical workings, etc.

1985		R.G. Barrett You Wouldn’t Be Dead for Quids (1989) 115: If ever you need a lift [...] give us a yell. No good you bustin’ a poofle valve.
2009		http://theroyalreviews.blogspot.co.uk 29 Nov. 🌐 We have the same Internet and TV company and on Friday night they blew a poofle valve (that’s technical talk for ‘it’s not working’) .
2012		Twitter 25 June 🌐 Christopher is at risk of bursting a poofle valve.

2. (Aus.) a notional ‘valve’ that controls one’s emotions; esp. in phr. bust one’s poofle valve, to lose control.

2011

theaustralian.com.au 9 June 🌐 [...] We checked in with Emmo’s office. Quoth they, ‘He first heard it from his father, who used to warn him not to blow his poofle valve whenever he exerted himself or got a little hot under the collar. He reckons it's an old country expression used by his dad’s generation’.