You use proverbial to show that you know the way you are describing something is one that is often used or is part of a popular saying. My audience certainly isn't the proverbial man in the street
widely known and spoken of; "her (Atasözü)ial lateness"; "the (Atasözü)ial absentiminded professor"; "your (Atasözü)ial dizzy blonde" of or relating to or resembling or expressed in a (Atasözü); "he kicked the (Atasözü)ial bucket"; "the (Atasözü)ial grasshopper