"Lavender Haze" is a fictional term created for the television show Mad Men. It was used to describe the feeling of being in love. Although some claim the term was widely used in the 1950s, there is little to no evidence to support its use in this context before the show.

The example below is a transcript of the scene where it is used. It is from Mad Men Season 2, Episode 12 "The Mountain King", which aired in 2008.
Don: I met a girl.
Anna: Another one?
Don: She's so beautiful and happy. She's a model. And she's from a good family, and she's educated.

Anna: What's her name?
Don: Elizabeth--Betty. I want you to meet her.
Anna: Look at you, you're in the lavender haze!
Don: I just like the way she laughs...and the way she looks at me.
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Lavender Haze” is the second single on Montgomery’s second EP “Opal 67”, which was released in December 2021.

According to Montgomery, the song title was inspired by the television show Mad Men, where she'd first heard the term "lavender haze".

When asked what the term means to her, Montgomery said, “Falling in love isn’t always rose coloured. It can get dark and muddied by so many emotions that come up and I feel like that’s the ‘Lavender Haze’.”
Lyrics from Montgomery's "Lavender Haze"

Chorus
I don’t know what you want me to say
You caught me in a lavender haze
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"Lavender Haze" appeared in a poem by Cecil Choi titled "Sleeping Bags", which was published in The Main Review, Vol. 7, No. 3 in September 2021.

The Main Review introduces Choi as a queer, trans, and disabled person of color who enjoys exploring the intersections of their identities in their work.

You can find the poem in its entirety on The Main Review's website.
Lines 3-7 of "sleeping bags" (mentioning lavender haze)

so we listen to the gossamer touch
of our feet on the linoleum floor
echo like a shared secret
and we step out into the lavender
haze of 2 AM.
by m1dn1ghts October 9, 2022
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The confusing, exciting, and all-consuming state of mind for a queer person (esp. women/sapphics) right before they realize they are gay/come out to themselves. Usually triggered by falling for someone of the same sex, or beginning to feel attraction to the same sex and slowly coming to terms with their sexuality as a result.
Yeah, I was really going through the lavender haze after meeting Julie and wanting to spend EVERY day with her. Took me a minute to realize I was too in love to think straight!
by countrywesternboots October 10, 2022
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(N) The perhaps erroneous name for the area west of Broadway in the upper portion of New York's Washington Heights so called for an allegedly bustling gay population. Referred to by realtors as "Hudson Heights."
"I have no idea what kind of place the Monkey Room is trying to be, but it is on Lavender Hill..."
by press-bee April 2, 2006
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