Lana literally translates to "wool" but in many Spanish-speaking countries, it's a very common and informal slang term for "money." It's similar to how English speakers might say "cash" or "dough."
In the song, the lyric "Nos vamos a gastar más lana" means "We're going to spend more money." This word is interesting because it's a great example of everyday slang that learners might not find in a textbook, making it valuable for understanding authentic spoken Spanish in music.
Neton Vega spends this whole song adding up what a good night costs. "Su set full de Balenciaga" (Her whole outfit is Balenciaga) and "Bolsita Dolce Gabbana" (A little Dolce Gabbana bag) sit right beside "Nos vamos a gastar más lana" (We are going to spend more cash), and he sounds pleased about all of it. The title line is the joke and the promise at once: "Tú sigue bailando, yo estaré aquí, soy tu perro fiel" (You keep dancing, I will be right here, I am your faithful dog). He is not asking her to stop, or even to look over. He will wait. Phone off, cigarette lit.
Underneath the shopping list there is an ex being written out of the story. "Ya pasó casi un año" (Almost a year has gone by) and "Con ella no te extraño" (With her I do not miss you) is about as blunt as a breakup line gets, and "Ya ese cuento está borrado" (That story is already erased) says it again in case anyone missed it. The Miami verse is the memory he keeps instead. Then the last section drops the romance entirely for "La arena, el alcohol, tanta adrenalina" (The sand, the alcohol, so much adrenaline) and "Alteras mi pulso como cocaína" (You mess with my pulse like cocaine). The track never raises its voice, which makes the boasting land like a shrug rather than a flex.