When a carpenter is hammering a nail into some wood and the head of his hammer misses the nail and hits the surrounding wood, it makes a small depression there in the shape of the hammer head. That is a Chicago Rosette.
1) Careful on that last piece of oak there boys, we don't want the customer seeing any Chicago Rosettes.

2) Who's the dumbshit who left a Chicago Rosette on that moulding?!
by Don Garb July 13, 2005
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a brown rosette is the description of your anus hence it looks like a rosette (rose flower).......
go on love..... show us your brown rosette....... or i int going down on that brown rosette unless its been bleached!
by anus angus September 18, 2008
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