Can multitask be an adjective?

Hi there


I've recently learned I've been using the word "multitask" complety wrong, I've always thought it was an adjective, then I could say "Ben is a multitask guy" but I was checking on the dictionary and turns out it's a noun and a verb, so instead of saying "Ben is a multitask guy" I would have to say "Ben has been multitasking", but calling somebody a multitask person sounds so natural to me, doesn't it exist at all?

Thanks