This is the 154th most frequent Italian word.
qualcosa
"Something."
In this context, 'qualcosa' represents an unspecified item of food or drink to consume.
Vorresti mangiare qualcosa?
Would you like to eat something?
'Qualcosa' here metaphorically references an intuition or feeling, used as a subject in the sentence.
Qualcosa mi dice che dovrebbe piovere presto.
Something tells me that it should rain soon.
Here, 'qualcosa' means 'something' and refers to an indefinite subject which is elaborated as 'di interessante'.