He appeared also to be saying he had inside information about it that he could only chortle about, unable to spell it out.
Lewis Carroll really did introduce the word “chortle” to the English language in his 1871 poem Jabberwocky.
coined 1872 by Lewis Carroll in "Through the Looking Glass," perhaps from chuckle and snort. Related: Chortled; chortling. As a noun, from 1903.