Exhaustos means "exhausted" or "worn out." It's a strong and descriptive word that goes beyond simply being tired.
In the song, the lyrics encourage listeners to "Mover el cuerpo hasta caer exhaustos" (Move your body until you fall exhausted). It vividly paints a picture of dancing with such passion and energy that you're completely spent, emphasizing the joy and intensity of the moment.
Café Tacvba's "1-2-3" feels like a sweet, slightly anxious plea to a new love to stick around. The singer is totally smitten, telling this person, "Jei Beibi, Te quiero así" [Hey Baby, I love you like this] and begging them not to disappear or lose their head. He's worried this connection might just be another fleeting story, asking, "Cómo te pido que no seas una más / De las historias que se cuentan a diario" [How do I ask you not to be just another / Of the stories told daily].
It's a song about wanting to make a good thing last, even while acknowledging the overwhelming number of other possibilities out there. The counting in the chorus, "Un, dos tres, cuéntalos bien" [One, two three, count them well], seems to refer to all the other people or experiences, but the singer just wants to keep dancing and enjoying the moment, saying, "De este baile hay que gozar" [We have to enjoy this dance]. He's ready to go wherever this person goes, declaring, "Yo voy contigo pase lo que pase" [I'll go with you no matter what happens], believing that "El amor siempre ganará" [Love will always win].