A disgruntled passenger on a budget airline has penned a hilarious and sarcastic letter to the person sitting behind her on a flight from Singapore to Sydney.

Lau Munyee , who is based in Malaysia, shared the note on social media about the flight she took on April 12 while sitting in seat 14A.

She describes the fellow traveller sitting behind her in seat 15A on the AirAsia flight as a loud-mouthed, snack-guzzling passenger who had feet that smelt like 'death and decay'.

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Lau Munyee , from Malaysia, was flying from Singapore to Sydney on AirAsia when she encountered the passenger from hell

She claims the woman took off her shoes and stuck her feet, which she described as smelling of 'death and decay', in between her seat and the window (pictured above)

Ms Lau, 24, also said the woman gave her a full back massage by 'repeatedly kicking the back of chair'.

'To date, I have yet to regain full mobility of the lower half of my body. But since I am single, I suppose I don't have much use for it anyway,' the writer, who runs blog iaremunyee.com, quipped in the letter.

She went on to say: ' I did not pay for the in-flight entertainment package and I was worried that I might get bored. But my concerns were unnecessary.

'You were talking so loudly, as if your friend was seated in the cargo hold rather than right next to you.'

She penned the open letter while on the April 12 flight on a motion sickness bag

She was flying to Sydney for a holiday with the budget airline. The ticket cost her AU$640

Just when Ms Lau thought the situation could not get any worse the passenger decided to take off their shoes and put her smelly feet between the writer's seat and plane window.

'For immediately, my nose was assaulted by a putrid smell of death and decay,' the freelance writer wrote.

'The stench was so strong that I turned to check if the old lady seated next to me was still breathing.'

Ms Lau is a freelance writer based in Malaysia and was on her way to Sydney for a holiday

The incident had caused Ms Lau so much distress that she could not wait to get off the plane to write the open letter.

'I flew Air Asia, and paid about MYR 1800 [AU$ 640] for a round trip. The flight was at midnight. I was travelling for a holiday,' she told Daily Mail Australia.

'I wrote the letter on the motion sickness bag because I couldn't sleep a wink throughout the entire flight and had to find a means of distracting myself from the smell - short of jumping off the plane.'