For something (usually not a physical object) to be brought up; usually in conversation or the acts of a superior.
The subject of the war in Iraq reared its ugly head again.
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A blowjob in the backseat of a car.
My girl and I were with another couple so we climbed in the backseat and I got some rear head.
A commonly misused phrase.
- Someone so ugly, that at the sight of them, you want to shove their head up their rear-end to prevent you from being sick.
Bloody hell! Look at the state of Brendan's face. We should definitely rear it's ugly head...