Aw-shucks is an expression typically used to convey humility, modesty, or embarrassment. Unfortunately, there is no direct antonym for this phrase, as it is not necessarily an emotion but rather an expression used to convey various sentiments. However, some phrases that convey opposite emotions include self-confidence, boasting, and arrogance. These antonyms suggest a person who is unapologetically confident in their abilities and doesn't feel the need to downplay their accomplishments or thoughts. While aw-shucks may suggest modesty, its antonyms suggest a person who is proud of their achievements and actions.