butt heads

butt heads

1. Literally, to knock heads together, as of rams or sheep. The two male rams fiercely butted heads to establish dominance among the group.2. By extension, to completely disagree or get into a heated confrontation with someone. Jonathan and Cynthia always butt heads over politics when they're together. I got kicked out of the bar when I started butting heads with that guy.See also: butt, head