Q-Bert speaks like that because his entire language (Q-Bertese) is just cursing. He is credited by Guinness World Records as the first video game character to curse out loud in their 2017 Gamer's Edition book.
You would think after all these years of cartoons and comic books that someone somewhere would have made a grawlix dictionary so some newbie would know how to do this shit. Also anyone know the name of the little guy in Wreck it Ralph that always spoke weird?