Gross out Definition 1 of 3Pro Tip 1/3Emotional Intensity Use 'gross out' to express strong emotional disgust, not just mild dislike. I'm really grossed out by the smell of rotten eggs. Pro Tip 2/3Informal Usage 'Gross out' is informal; avoid it in formal writing or speech, like academic papers or job interviews. She grossed me out with her eating habits. Pro Tip 3/3Visual Imagery Often used to describe visual disgust, such as unappealing food or gory images. I was totally grossed out by those nasty food pictures.