The "Bad Guy" hitmaker's single came out earlier this week, with lyrics hinting that not everything is "how she dreamed it", reports metro.co.uk.
In the track, the 17-year-old singer sings: "I had a dream I got everything I wanted... It might have been a nightmare to anyone who might care."
During an appearance on Zane Lowe's Apple Music Beats 1 radio show, Eilish said how the song has "so many meanings", which makes it even more satisfying to her.
She said: "What satisfies me so much about this song is that it's not me s**tting on fame. It's me talking about how sometimes everything you wanted is not what you actually should. You know what I mean? It might not be exactly how you dreamed it because it is a dream."
"It feels very satisfying. Very satisfying. And also the song has so many meanings. Every lyric in that song has a very specific meaning and specific instance that it was written about. I just want to just sit down and write what every single line means just for myself, even if it's never shared with anybody."
Eilish recorded the song with her brother Finneas, a musician and producer and they truly went above and beyond for it.
( With inputs from IANS )