What does si tu realmente listos mean?

"Si tu realmente listos" is grammatically incorrect in Spanish. However, it likely comes from a mix of Spanish and English and could be interpreted in a couple of ways:

1. "Are you really ready?"

This is the most likely interpretation, assuming the speaker is trying to combine Spanish with a common English phrase. In Spanish, this would be translated as "¿Estás realmente listo?"

2. "If you are really ready"

This interpretation is less likely but possible, depending on context. In this case, it would be translated as "Si estás realmente listo".

Remember: It's important to understand the intended meaning and speaker's background to get the most accurate interpretation.