yahoo
n. countablen. a person who is very rude, loud, or uneducated. You use this to describe someone who acts in a rough and annoying way.
n. a crude, coarse, or unintelligent person. Derived from the brutish race of creatures in Jonathan Swift's Gulliver's Travels; carries a derogatory and informal register.
Some yahoo was shouting in the street all night.
The quiet gallery was suddenly filled with a group of yahoos who had no respect for the art.
The editorial dismissed the protesters as a pack of unthinking yahoos, ignoring the legitimate economic grievances that had driven them to the capital.
Coined by Jonathan Swift in Gulliver's Travels. According to the Century Dictionary, "[a] made name, prob[ably] meant to suggest disgust".
From the company name Yahoo!; see more on origin there.
Often used as a mild insult to describe someone lacking social grace or intellectual depth.