I had a beat come to me with a kiss on her
So I jumped on 'er just to let her know what’s mine

from Los – Welcome To Swaggsville Intro Lyrics on Rap Genius

Meaning

Los owns the beat and is jealous as fuck, if it’s been runnin' around behind his back he’s gonna let her know who’s boss. (He also “jumps on beats” as a rapper)

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