Longman Dictionary of Contemporary English
bovver
noun
EXAMPLES FROM CORPUS
▪ Zoe is a quirky lady who says she's more at home wearing bovver boots than elegant stilettos.
Douglas Harper's Etymology Dictionary
bovver
1969, Cockney pronunciation of bother "trouble" (q.v.), given wide extended usage in skinhead slang.
Wiktionary
bovver
n. 1 (eye dialect of bother English) 2 (context British slang English) violence, especially that associated with youth gangs.
Wikipedia
Usage examples of "bovver".
A lot of Bovver boys on their motorbikes by the war memorial eyed Taggie with great interest.