In our search for discovering natural language (of a 4 year-old), a beautiful new term has become part of our daily lives. The term was first pronounced by our own Trinity Wiideman and has now been defined by Lumbo.org as anything except for a fart. Ref: Wikipedia
This direct answer was a thrilling revelation to both of us as parents, after 6 years of deer in the headlights reaction to the term used in conversations, sometimes as a noun (“you’re a lumbo”) and other times as an adjective or adverb (“that was a lumbo move”).
Case solved folks.