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1.
a hat very commonly worn in america during the 1920s. The hat then went out of fashion although some people still wear them today. Anyone seen wearing a trilby in modern times can official be labelled a twat.
1920's Joe: "How do you like my new trilby?"
1920's Harry: "That's a mighty fine looking hat"

2010 Joe: "Hey man check out my new trilby"
2010 Harry: "Dude you're such a twat"
by James Jacksonville May 04, 2010
 
2.
The mandory hat of stereotype rain trodden American 1920's journalists
That Reporter from Batman
by Adam McDermott June 24, 2005
 
3.
the best hat invented ever!!!!!!!!
"dude, your hat is rockin.."
"i no, its a trilby...hahaha"
by aliceyyyyy May 26, 2007