Have a thing about somebody/something Definition 1 of 3Pro Tip 1/3Emotional Intensity Expresses strong feelings, either positive or negative, towards something. Mark has a thing about old cars; he loves them more than anything. Pro Tip 2/3Not Always Rational The liking or disliking may not be based on reason or logic. Sara has a thing about boats, even though she's never been on one. Pro Tip 3/3Personal Quirk May indicate a peculiar habit or preference unique to the person. He has a thing about writing with blue ink only.