To do something milfily, you must either be a milf, look like a milf, or have a milf like aura. Originated on Reddit on r/AskReddit on Sunday, May 5, 2019 and was coined by u/markste4321

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.