The Billie Eilish hit song resonated worldwide last year, dominating charts, streaming services and carpool karaoke, (I'm speaking of my very own carpool here, but Eilish did front up on the James Corden TV segment too!).

So you're a tough guy

Like it really rough guy

Just can't get enough guy

Chest always so puffed guy

I'm that bad type

You get the idea, guys!

The lyrics get under your skin, enough, guys?!

On Monday AEST, bad guy was named Song of the Year at the Grammy Awards in Los Angeles.

Incidentally, it topped this year's Hottest 100 on triple J at the weekend.

At 18, Eilish was the youngest person to top the annual countdown and made history as the first female solo artist to hit #1. (Fun fact: Zombie by The Cranberries was the first #1 song in 1994 with a female vocalist in the band.)

Topping the charts in 20 countries, bad guy has become so huge it's hard to fathom its small beginnings.

The homegrown hit was written and recorded by Eilish and her songwriting big brother Finneas, 22, in Eilish's bedroom in Los Angeles.

They have worked together since Eilish recorded Ocean Eyes - for her dance class - as a 13-year-old, as you do!

From its minimalist production and some might say - like my husband - minimalist lyrics, bad guy breaks just about all of the rules of #1 singles.

Billie told triple j back in March 2019: bad guy is "about glorifying people and their B.S".

"How we all tend to lie to everybody, and ourselves, about our personas and talk about who we are, and it's actually completely untrue," she said ahead of her Australian tour.

"It's poking fun at how we all puff up our personalities, especially online, in a bid to convince others we're something we're not.

"Making fun of that, also making fun of myself for doing that."

As kids head back to school this week after the marathon summer holidays, it's handy to know who they look up to and what inspires them.

Good role models - especially in the pop music industry - are sometimes thin on the ground.

However, Gen Yers - those born between 1995 and 2015 - are drawn to Eilish, like a moth to a light.

My tween says it's because Eilish is unique; she wants her fans to be true to themselves too.

She says Eilish wears baggy clothes so she's not judged for her appearance. It might be crystal-embroidered, baggy Gucci, but it's baggy all the same!

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Eilish's stylist Samantha Burkhart, who has been working with the singer since she was an unsigned 14-year-old, was immediately drawn to her dress sense.

"The look was interesting because it didn't sync up with the music," she told British Vogue.

"That 'look' is one that has become synonymous with Eilish: oversized everything."

There has been much speculation about Eilish's wardrobe, which is made up almost entirely of loud, brightly coloured, but defiantly non-revealing streetwear.

Eilish's raw and honest lyrics offer teenagers an emotional connection, often missing from the puffery of social media.

She taps into the common themes of love and breakups but doesn't dance around darker ones like death, depression and anxiety.

John Marsden (The Art of Growing Up) says we do kids a disservice when we spare them access to conversations about sex, suffering and death; what he calls the mysteries of life.

Turns out, good role models come in all shapes and forms.

If you - like me - however, had only just managed to get Eilish's Grammy Award-winning tune out of your head, my apologies!

I'm the bad guy, duh!