The spelling of "MNKY" may seem unusual, but it is actually a phonetic transcription of the word "monkey." The IPA (International Phonetic Alphabet) transcription for "monkey" is /ˈmʌŋki/. The "M" and "N" in "MNKY" represent the nasal sounds /m/ and /n/, respectively. The missing vowels are likely due to the fact that this is a slang or text speak version of the word. While it may not be considered proper spelling in standard English, it is a common shorthand used in informal communication.