noun-modifying (irregular)
Prenominal form of 脂ぎる, describing something that is oily or greasy, often with a negative connotation of being unpleasantly shiny or slick.
脂ぎった料理は苦手だ。
I don't like greasy food.
彼の脂ぎった顔が気になった。
His oily face bothered me.
脂っこい is an i-adjective meaning 'greasy, fatty' and can be used predicatively, while 脂ぎった is a prenominal form often implying an unpleasant oiliness.
Derived from the verb 脂ぎる (to become oily), which combines 脂 (oil, fat) with ぎる, a suffix indicating a state or tendency.