godan verb (-ru), intransitive verb
Colloquial or dialectal variant of 見つかる (みつかる). Used in casual speech, often with a nuance of something turning up unexpectedly or being spotted.
See also: 見つかる (みつかる)
探してた本がやっとめっかった。
The book I was looking for finally turned up.
こんなとこにめっかるとは思わなかった。
I didn't expect to find it in a place like this.