1772, from roost (earlier roost cock, 1606), in sense of "the roosting bird," favored in the U.S. as a puritan alternative to cock (and compare roach).
n. the posterior; one's butt end. (Because one roosts on it.) : Don't just sit there on your rooster. Get to work.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences
Theoretically, a weak rooster could fool hens by growing a deceptively large comb.
Undercover agents arrest a suspected rooster fighter while in possession of contraband birds.
When someone set the alarm in the internal clock, they would click on a picture of a rooster.
Rooster was worried about the foolish thing that had happened, too.
We have this three-penny dictator, this bantam rooster of no consequence.
Undercover officers pose as construction workers to gather evidence of rooster fighting.
According to an alternate translation, the name meant: the rooster that watches over all the hens.
Someone had bought the rooster and hens as a way of combating the recession.
If a rooster crows every minute of every hour of every day, eventually it will crow when the sun rises.