You bet! Definition 1 of 2Pro Tip 1/3Friendly Assent Shows eagerness to help or agree in a friendly manner. 'Can I count on your support?' - 'You bet!' Pro Tip 2/3Informal Usage Used mainly in casual conversation, not in formal situations. 'Are you coming to the BBQ?' - 'You bet!' Pro Tip 3/3Enthusiastic Response Indicates a strong and positive response; more emphatic than just 'yes.' 'Do you want to try the new roller coaster?' - 'You bet!'