Art expression

Turning my back for a mere couple of minutes, my lil' artist had gone wild making art on her hands instead of on the paper. I pointed my fingers at every stroke on her hands questioning her "What is this?" and she looked into my eyes innocently saying "This?..". All of the sudden, she blurted out, "This's.... TATTOO!". Her response really caught me off-guard. Where's on earth did she learn the word "Tattoo" from? The other day, she kept saying "Awesome! Awesome!", cracking us up.