Mouthing off is an expression used to describe someone who speaks in a disrespectful or rude manner. The crossword solutions for this term are SASS (4 letters), FRESH (5 letters), SASSY (5 letters), and INSOLENT (8 letters). SASS stands for 'Sarcastic Attitude and Smart-alecky Speech', and is used to describe someone who speaks in a sarcastic or witty way. FRESH is used to describe someone who speaks in a bold, daring, or cheeky manner. SASSY is a combination of SASS and FRESH, and is used to describe someone who speaks in a bold, daring, and sarcastic manner. Lastly, INSOLENT is used to describe someone who speaks in a rude, disrespectful, or contemptuous manner.