push-button
adj.— «Jockeys like to call horses like Big Brown “push button”—they respond to commands instantly and easily.» —“Preakness laugher leaves Big Brown in line for glory” by Pat Forde ESPN.com May 18, 2008. (source: Double-Tongued Dictionary)
Further reading
When there’s no evening meal planned at home, what do you call that scramble to cobble together your own dinner? Some people apply acronyms like YOYO — “you’re on your own” — or CORN, for “Clean Out your Refrigerator...
Wendy from Charlotte, North Carolina, was baffled when a co-worker asked, Are you ready to race for pinks? The phrase racing for pinks refers to participating in car races where the winner gets ownership of a car, the pinks referring to the pink...