"The conversation came up, 'Should I eat it?'".
Sam Ballard, 28, was dared to eat the bug when he was only 19 at a party, but it left him paraplegic and thrust him into a horror 420-day coma after he contracted eosinophilic meningo-encephalitis.
"We were sitting over here having a bit of a red wine appreciation night, trying to act as grownups and a slug came crawling across here", Jimmy Galvin, one of Sam's best friends, recalls.
The unusual and sad case occurred because, along with the slug, Ballard had swallowed a parasite called Angiostrongylus cantonensis, commonly known as rat lungworm, which the slug likely picked up from rat droppings, according to the U.K.'s EveningStandard.
The Sunday Project host Lisa Wilkinson confirmed that he died "surrounded by his family and loyal, loving mates".
"We have some sad news for you now".More news: Rihanna shuts down Donald Trump over his 'tragic' rallies
Ballard's story made headlines earlier this year after medical funding used for his care and provided by the Australian government's National Disability Insurance Scheme was reduced by half; the government eventually reversed the decision following extensive media coverage and an appeal by Ballard's family, News.com reported. "He contracted rat lung disease with devastating effects".
Eight years after falling ill it was announced that Sam passed away on Friday, November 2.
Mr Ballard's last words to his mother Katie were: "I love you".
Prior to the dare Mr Ballard was a promising young rugby star at Barker College on Sydney's north shore.
His close friends often visited him, even if it was a "shock" to see their mate struggling.
He said: 'When I walked in, he was very very gaunt, and there were cables everywhere - it was a big shock'.More news: Iranians Condemn US Arrogant Policies in Nationwide Rallies
He later added: "We like to sit down and watch the footy and watch the rugby".
Before the accident, Mr Ballard's mother Katie described how she saw her son as "invincible".
"Physios had Sam standing in the frame at the gym", she wrote.
"Told him it was the stress of the last 16 months that had affected my eyesight". He is still the same cheeky Sam, and laughs a lot.
Katie spent years fighting for adequate care for Sam after 2010.
The massive funding cut was without explanation and around-the-clock care means the Ballard family are heavily in debt and now owe a nursing service £25,000.More news: After Nine Years In Orbit, Kepler Telescope Leaves A Legacy Of Discovery