International translations

I field questions all day, correct diction, repeat back the preferred form and generally exhaust everyone with my efforts. During a brief lull my youngest pipes up, “lookie, lookie, lookie!”
We look, all of us, out of the window and follow the pointy finger.
“What are we looking at dear?”
“Er…..dat car’s butt is dirty,” he chortles, with quite the filthiest undertone of a brothel creeper.
“Ah…..someone’s written in the muck……anyway….it’s a car boot.”
“Boot?”
“Yes, car boot, not car butt.”
“Boot?”
“Yes, boot as in shoe.”
“Actually” she adds with a hint of smarm, “it’s car trunk mom, trunk as in back.”
“Er…” percolates the little one, “trunk……. as in elephant,” shortly before he dissolves into cackle on the floor.