The phrase "oily side" refers to someone who is cunning, dishonest, or manipulative in their actions or behavior. They might try to deceive others for personal gain. Full definition
Cover the dough with plastic wrap sprayed with oil, oily side down. (immigrantstable.com)
Some almond butters are more oily than others so if you feel your almond butter is on the more oily side go down to using half a cup instead of 3/4. (neuroticmommy.com)
Ideally, combination skin women don't usually use creme compacts, but if you're on the less oily side of the combination skin type, this one product definitely deserves a place on your list. (stylecraze.com)