Amarraditos is the diminutive form of amarrados, meaning "tied together" or "bound". The diminutive suffix "-itos" adds a sense of tenderness and intimacy, making it sound like "snuggled up" or "tightly embraced".
In the song, Ricky Martin sings, "Los dos amarraditos, tan cerca, tan solitos," which paints a sweet picture of two lovers intimately close, almost as if they are gently tied together by their affection. It's a charming and evocative word that captures the romantic essence of the lyrics.
Ricky Martin turns a party into a pickup line here. He opens by welcoming the room — "Hey bienvenidas, que suenen esas palmas por ser mis amigas" [Hey, welcome, let those hands clap for being my friends] — and admits straight away why he's there: "vengo con ganas de querer" [I've come wanting to fall in love], on the hunt for "un corazón que lata bien" [a heart that beats right].
Nothing here is subtle. He wants to dance salsa and Rock and Roll, land "los dos amarraditos, tan cerca, tan solitos" [the two of us tied together, so close, so alone], and get to the kissing — "los besos y abrazos van después" [the kisses and hugs come after] — as fast as the beat allows. It's a song built for the two minutes before you actually talk to someone, not the years after.