Estrujá' is a colloquial, shortened form of "estrujada," which means "wrinkled" or "crushed." It's a vivid and somewhat informal word that paints a clear picture.
In the context of the song, the lyric "Tú sabe' que nosotro' dejamo' la cama estrujá'" (You know that we left the bed wrinkled/crushed) implies intense passion and activity in bed. It's a memorable and slightly provocative word choice that stands out from more common vocabulary.
Get ready for a song about a secret, no-strings-attached relationship! The singer can't stop thinking about a woman, even though he knows she's with someone else and is supposedly happy. He makes it clear that their connection is purely physical, telling her, "Tú solo me llama' cuando quieras mi cama" (You only call me when you want my bed) and "Tranquila, baby, que aquí nadie se ama" (Relax, baby, 'cause nobody here is in love).
Their secret meetups are intense and hedonistic, filled with reggae music, marijuana, and passion that lasts all night. The lyrics paint a picture of a woman who spends time with her official partner but calls the singer in the early morning for a secret escape. He understands his role perfectly: her boyfriend is for love, but he's for pleasure. They are partners in this secret game, enjoying a luxurious lifestyle and solving any issues they have in the bedroom.