Do somebody’s head in Definition 1 of 2Pro Tip 1/3Colloquial Expression Used in casual conversation, not in formal situations or writing. I can't focus, this noise is doing my head in! Pro Tip 2/3Emotional Intensity Expresses strong feelings of annoyance or irritation. Every time we talk about politics, you do my head in! Pro Tip 3/3Not Literal It's a figurative phrase, not meaning any physical action. Your loud music does my head in, please turn it down.