The correct spelling for the phrase "has gettogether" is actually "has get-together". The hyphen between "get" and "together" indicates that these two words should be read as a single unit. In IPA phonetic transcription, this phrase would be written as /hæz ɡɛt-təˈɡɛðər/. The stress is on the second syllable of "get-together", with the primary stress on the "ge" and secondary stress on the "to". It's important to use proper spelling and pronunciation to effectively communicate with others.
"Has gettogether" does not have an established or recognized etymology, as it is not a standard English phrase or word. It appears to be a combination of "has" and "gettogether", which may have been formulated independently by the speaker or writer.