The well-dressed Mental as Anything star tells us the meaning behind his nickname.

Mental as Anything founding member and songwriter Andrew “Greedy” Smith has died in “unexpected” circumstances after suffering a heart attack in his car. He was aged 63.

Band manager Grant Bartlett has confirmed to AAP that Smith suffered a heart attack while driving in Sydney.

An ambulance arrived promptly to provide treatment but he later died.

Mr Bartlett, who has managed the Australian pop-rock band for 16 years, said Smith’s fatal heart problem came as a surprise.

“One of the healthiest guys I’ve seen,” Mr Bartlett said.

The band performed in southern NSW’s Tathra on Saturday night and was scheduled to perform in east Melbourne on Thursday.

It was formed in Sydney in August 1977 by Smith, along with Reg Mombassa, Martin Plaza, Wayne “Bird” Delisle and Peter O’Doherty.

Mombassa took to Twitter to say he was “shocked” to hear of his unexpected passing.

We are shocked and saddened to hear of the sudden and unexpected passing of Andrew (Greedy) Smith — Reg Mombassa (@regmombassa) December 3, 2019

Smith was also a vocalist, alongside Plaza, and keyboard player. He is survived by his fiancee Fiona Docker and son Harvey.

Fans are today paying tribute to the late muso:

#greedysmith ... another part of my youth gone ❤❤❤https://t.co/LBZ2rHhAjD — Bronwyn Dust (@gladysknows) December 3, 2019

Farewell @greedy_smith. You gave me Live It Up, He’s Just No Good For You, The World Seems Difficult - soundtracks to my life - and I will be forever grateful. #mentalasanything — Scott Keenan (@scottkeenan) December 3, 2019

We are extremely sad to hear about the passing of Andrew "Greedy" Smith. As a member of Mental As Anything @mentalsofficial, he was inducted into the ARIA Hall Of Fame in 2009. He was a huge character, with a big smile and boundless energy. That energy will be sorely missed. pic.twitter.com/T3rjEaXeAV — ARIA (@ARIA_Official) December 3, 2019

So sad to hear of the death of #GreedySmith. He created so much joy with his music. My thoughts are with his family, friends and fellow #MentalAsAnything band members. Rest In Peace Greedy 🕊 pic.twitter.com/r8dJkX3E6z — ᔕᗩᗰᗩᑎTᕼᗩ🌼 (@mantha_lee) December 3, 2019

The news of Smith’s death comes just a day after the death of another respected Australian musician, Noiseworks guitarist Stuart ‘Chet’ Fraser, who died after a three-year battle with lung cancer.