Plebada is a cool slang word used in Mexico, especially in the northern regions where this style of music originates. It's an informal way to say 'the crew', 'the gang', or simply 'the people'.
In the song, the artist sings, "Que ando bien loco dice la plebada" (The crew says I'm going crazy). He's saying that even his friends have noticed how lovesick and desperate he's become. Learning this word gives you a taste of authentic, modern Mexican slang!
Ever been left on 'read' while watching someone's status show they are actively online? That is the exact late-night spiral Tito Double P is dealing with in "Por Sus Besos". He keeps calling his girl, but her phone goes straight to voicemail: "Le estoy marcando y me manda al buzón" [I am calling her and she sends me to voicemail]. To make matters worse, her friend claims she is already asleep, but he knows better—she turns her phone off whenever she goes out drinking ("Siempre es la misma cuando anda tomada" [It is always the same thing when she is drunk]). He uses the blunt Mexican slang "ando que me lleva la chingada" [I am so pissed off / things are going totally downhill for me] to describe the total frustration of sitting around losing his mind while craving her touch, her voice, and her affection.
Things get even more pathetic (and relatable) in the second verse when he complains about being left alone during February: "Que feo estar solo en el mes del amor" [How awful it is to be alone in the month of love]. His friends—referred to here with the regional slang "la plebada" [the crew / the boys]—tell him he is acting crazy as he wanders around alone in the early morning ("la madrugada"), unable to sleep because his bed feels empty without her. It is a completely unfiltered track about nursing a broken heart ("Traigo roto el corazón" [My heart is broken]) and wondering how the other person could just forget everything so easily.