1. What does it mean?
치느님 blends 치킨 with 하느님, God. It affectionately elevates chicken into something worthy of exaggerated devotion, usually as a joke about how good it tastes.
Also written or said as chineunim
2. The nuance
It is food enthusiasm, not a religious statement. The mock-reverent wording may not suit every audience, and it is more playful than simply saying 치킨.
3. Examples
“오랜만에 먹으니 역시 치느님이네.”
Having it again after a while reminds me why people worship chicken.
“오늘의 주인공은 갓 튀긴 치느님이야.”
Freshly fried chicken is the star of today's meal.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.