。
I don't like greasy food.
Literal
Oily meal [topic-は] dislike is.
油っぽい ('oily, greasy') uses the suffix っぽい to turn the noun 油 into an adjective meaning 'having the quality of oil.' っぽい is productive and colloquial: 子供っぽい ('childish'), 怒りっぽい ('quick to anger'). 嫌いだ directly states dislike.