In 1896, the first lot of Cracker Jack was produced, the same year the product’s name and tagline “The More You Eat, the More You Want” were registered. It was named as if someone tasted it and remarked: “That’s a crackerjack!” (Crackerjack is a colloquialism meaning “of excellent quality”).

The link is to the Wikipedia article. Lotta multi-syllable words in there, just ask someone to read and explain it to you.