* It's a misspelling: Perhaps you meant a similar word like "aikido" or "aikuchi."
* It's a made-up word: Some people create words for their own purposes, such as in creative writing or online communities.
* It's a regional dialect: There might be a specific local dialect where "aikouka" has meaning, but it's not commonly recognized in standard Japanese.
If you can provide more context about where you encountered this word, I might be able to offer a better explanation.