This is the 183rd most frequent Arabic word.
وما
"And what" or "and not," depending on context.
In this sentence, 'وما' is used as part of a compound which negates knowledge about the event.
وما أدري ما الذي حدث.
And I do not know what happened.
Here, 'وما' is used to transition between two actions, with the second being negated.
قرأت الكتاب وما فهمت شيئًا.
I read the book, and I did not understand anything.
Here, 'وما' is used expressively in an exclamatory context to emphasize the beauty of the view.