Culote is a colloquial and somewhat playful term derived from "culo" (butt). While "culo" can be a bit vulgar, "culote" often implies a large or attractive backside, used in a more appreciative or even admiring way, though still informal.
In the context of the song, Lyanno sings, "En E11EVEN, pero pensando en tu culote." This line reveals that despite being in a club, his mind is still on his ex-partner's attractive figure. It's an enticing word because it's a bit edgy and directly expresses a raw, physical longing, making it memorable and relevant to the song's theme of missing a past lover.
Have you ever been so heartbroken that you keep listening to old voice notes from an ex, just to hear their voice again? That's exactly where Lyanno is in "NOTAS DE VOZ." He's stuck in the past, playing those voice notes ("Dándole play a tus nota' de voy" [Playing your voice notes]) and refusing to write another love song like the ones he used to dedicate to this person. He even tattooed their name in his notebook, thinking their love was eternal ("Lo de nosotros parecía eterno / Que hasta tatué tu nombre en mi cuaderno" [What we had seemed eternal / I even tattooed your name in my notebook]).
Now, he's just trying to cope. He's looking for his ex on Google Maps and WhatsApp, but they're nowhere to be found ("No me sale tu location en Google Maps / Ni tu foto en el WhatsApp"). He's out at clubs, surrounded by people, but still feeling empty and missing their embrace ("Los shots lleno' y vacía la casa / Tanta gente y no eres tú la que me abraza"). He's even wearing sunglasses to hide his pain, still thinking about his ex while out at E11EVEN ("Siempre gafas pa' que mi dolor no se note / En E11EVEN, pero pensando en tu culote"). It's a raw look at holding onto feelings, just in case they decide to come back ("To' mis sentimientos los guardo / Por si un día decide' regresar" [I save all my feelings / In case one day you decide to return]).