Stands for "to be completely honest with you bro", a euphemism often used by Dan Abel to preface bad news, criticism, or just about anything. According to Jewish legend, these were the first words he ever spoke, followed by "mum" and then "dad".
Used as to be quite honest with you fam, but in text can be used to make your text look like random keyboard smash. Please do not use it when texting with someone.