be the (absolute) limit

To be a source of intense aggravation. Oh, I can't listen to that fool any longer—his idiotic questions are the limit! These forms the HR department makes us fill out are the absolute limit, I'm telling you! This audit has been the absolute limit for my whole team. Thank goodness it's almost over!

be the limit

be intolerably troublesome or irritating. informal

be the (absolute) ˈlimit

(old-fashioned, spoken) be a very annoying person or thing: You’re the limit, Michael. I’ve been waiting for you for over two hours. Where on earth have you been? ♢ The trains on this line are the absolute limit. They are never on time.