When used as a warhorn it can mean either "here comes fun!" or "I'm coming to kill you" (or both) depending on the context. The Axemen currently have two in their possession, yet they don't possess an ability to play them with any talent, which may help to explain why so many are after their heads.
Otherwise defined as an ear-splitting good time.
The bugles commonly called "cavalry bugles", because that's what they come with, have no keys and can only play 4ths and 8ths. (ex. A B flat bugle can only play B flats and Fs, though of many octaves.)
Modern bugles are keyed and also called Kent Bugles.
Bugle (heraldic device)
Bugle or bugleweed is a member of the mint family.