Listón means "ribbon", and it's the central, iconic image in this classic cumbia song.
The famous line "Suelta el listón de tu pelo" (Untie the ribbon from your hair) is a deeply romantic and evocative request. It's a poetic way of asking someone to let their hair down, both literally and figuratively, symbolizing the start of an intimate and passionate moment.
This song is all about pent-up desire finally being released! The singers have clearly wanted each other for a long time, describing the frustration of being close but not together: "Me mordía los labios al no poderte besar" (I bit my lips not being able to kiss you) and "Mi piel se estremecía al no poderte tocar" (My skin shivered not being able to touch you). Now, the night they've been waiting for has arrived, and they're ready to leave all pride and vanity behind for a "noche sensual y bohemia" (sensual and bohemian night).
It's a duet, so you get both sides of the story. He asks her to "Suelta el listón de tu pelo" (Untie the ribbon in your hair) and let her dress fall away. He promises to "beberé del perfume de tu piel" (drink the perfume of your skin). She's just as eager, telling him, "Provócame mis labios, hazme tuya de una vez" (Provoke my lips, make me yours at once). It's a classic cumbia from the masters, Los Ángeles Azules, who proudly shout out their home base: "De Iztapalapa para todo el mundo" (From Iztapalapa for the whole world)!