Rootintootin is an old-fashioned slang term that denotes excitement or enthusiasm. If you want to use a synonym for rootintootin, there are plenty of options to choose from. Some of the most common synonyms include lively, exuberant, spirited, lively, dynamic, and buoyant. All these terms define a positive energy that one can feel while participating in activities that inspire joy. Other synonyms for rootintootin include thrilling, exhilarating, and lively. Several other terms can be used as a synonym for rootintootin based on the context in which it's used and the connotation you want to convey.