Meaning of iddy-umpty in English:

iddy-umpty

Pronunciation /ˌɪdɪˈʌm(p)ti/

noun

rare, slang Military
  • The Morse code; a dot followed by a dash in Morse code.

Origin

Early 20th century; earliest use found in Punch. Imitative of the dots (short signals) and dashes (long signals) used in Morse code.