From Longman Dictionary of Contemporary EnglishI’ll have you knowI’ll have you knowANNOYused to start to tell someone something when you are annoyed with them I’ll have you know you’re insulting the woman I love. → have
Examples from the Corpus
I’ll have you know• I've never taken the easy way out, I 'll have you know.• I 'll have you know this is the very latest design.• I'll have you know I speak six languages. 