[Intro: Swae Lee]
Ayy, ayy, ayy, ayy (Ooh)
Ooh, ooh, ooh, ooh (Ooh)
Ayy, ayy
Ooh, ooh, ooh, ooh
[Verse 1: Swae Lee]
Needless to say, I keep a check
She was a bad-bad, nevertheless (Yeah)
Callin' it quits now, baby, I'm a wreck (Wreck)
Crash at my place, baby, you're a wreck (Wreck)
Needless to say, I'm keeping a check
She was a bad-bad, nevertheless
Callin' it quits now, baby, I'm a wreck
Crash at my place, baby, you're a wreck
Thinkin' in a bad way, losin' your grip
Screamin' at my face, baby, don't trip
Someone took a big L, don't know how that felt
Lookin' at you sideways, party on tilt
Ooh-ooh, some things you just can't refuse
She wanna ride me like a cruise and I'm not tryna lose
[Chorus: Swae Lee]
Then you're left in the dust, unless I stuck by ya
You're the sunflower, I think your love would be too much
Or you'll be left in the dust, unless I stuck by ya
You're the sunflower, you're the sunflower
[Verse 2: Post Malone]
Every time I'm leavin' on ya (Ooh)
You don't make it easy, no (No, no)
Wish I could be there for ya (Ooh)
Give me a reason to, oh (Oh)
Every time I'm walkin' out (Oh)
I can hear you tellin' me to turn around (Oh, oh)
Fightin' for my trust and you won't back down (No)
Even if we gotta risk it all right now, oh (Now)
I know you're scared of the unknown (Known)
You don't wanna be alone (Alone)
I know I always come and go (And go)
But it's out of my control
[Chorus: Post Malone]
And you'll be left in the dust, unless I stuck by ya
You're the sunflower, I think your love would be too much
In the film and lyric video, the lyrics are changed from “ride me” to simply “ride”
This is probably done to avoid any suggestive undertones, as the film is aimed at kids and young teens.
“Sunflower” is Miles Morales‘ favorite song; he sings it throughout the 2018 film, Spider-Man: Into the Spider-Verse.

Sunflowers are known to rapidly deplete their soil of nutrients. Swae Lee and Post Malone may be using this as a metaphor for the effects that several characters have on Miles, which simultaneously overwhelm and motivate him throughout the movie. This is similar to how a sunflower is destructive and yet produces something beautiful.
This line would have originally been “She was a bad-bitch, nevertheless” but bad-bitch was changed to bad-bad to make the song more appropriate for the movie.
The act of “taking the L” means taking a loss or losing. Depending on the context, it can mean literally failing at something or needing to accept one’s loss.