This is the 14377th most frequent German word.
irgendetwas
"Something" or "anything."
Here, 'irgendetwas' is used to ask if there is anything of interest found, indicating an unspecified 'something'.
Hast du irgendetwas Interessantes in deinem Buch gefunden?
Did you find something interesting in your book?
In this context, 'irgendetwas' expresses an indeterminate sound that was perceived.
Ich habe irgendetwas gehört, aber ich weiß nicht was es war.
I heard something, but I don't know what it was.
Here, 'irgendetwas' refers to an unspecified event that could occur in the future.