Batallosa is a fantastic piece of Mexican slang that means "troublesome," "feisty," or "hard to deal with." It comes from the word batalla, which means "battle," so someone who is batallosa gives you a fight.
In a spoken line, Chalino Sanchez says of his lover, "Eres más batallosa que hacer gárgaras boca abajo" (You're more troublesome than gargling upside down). This hilarious and vivid comparison makes batallosa an incredibly memorable word, perfectly capturing the frustrating yet captivating nature of the person he can't forget.
Chalino Sánchez takes on the stubborn ache of unrequited love in "Me Persigue Tu Sombra" (Your Shadow Chases Me). Even with years passing, he admits he cannot shake his ex: "He pensado olvidarte al correr de los años / Pero nunca podré, me persigue tu sombra" (I have thought about forgetting you as the years go by / But I never will be able to, your shadow chases me). Between waiting for nightfall and crying over being treated like extra baggage ("mi vida te sobra" / my life is left over to you), he also sneaks in some spite. He warns her that destiny will punish her by withering her dreams ("Marchitando tu vida o negándote anhelos") so she finally learns what it feels like to hurt with no comfort in sight.
Beyond the heavy drama, Chalino drops a wonderfully colorful piece of Mexican slang right in the middle: "Eres más batallosa que hacer gárgaras boca abajo" (You are harder to deal with than gargling upside down). In everyday speech, batalloso describes someone who is fussy, stubborn, or exhausting to manage, and comparing a difficult lover to the impossible physics of upside-down gargling is both funny and brutally direct. He pours his heart out while keeping that gritty, conversational edge that makes his music stick with you.