Any parser parsing the text/sentence/fragment containing this cmavo, must answer that the whole text/sentence/fragment is not syntactically not correct.
Joke word, etymologically related to xa'oi, xa'a'a and oi; so laughing from having made that the parser crashes too early. Even if its grammar is totally free (i.e. it can appear anywhere), a parser must answer "syntactically not correct" even if the text without xa'oi'a'oi'a was syntactically correct.