you bet: Interjection you bet 1. (idiomatic) Expresses support, agreement, certainty or emphasis. ● You bet they'll re-run such a successful show next season. 2. (idiomatic, informal) Certainly; you're welcome; a reply to thank you or to a request. ● "Hey, thanks for all your hard work yesterday."/"You bet!" ● "Could you give me a hand?"/"You bet!"