A now defunct prison exclusively for delinquent youths and under 18's who have broken the law.
That Tom is a complete hooligan, he's going to be sent to Borstal
by Mooma August 11, 2006
1 more definition
a very very very ugly girl. a step up from being a munter,
Fuck me!!! after 79.576 pints, she looked ok. now however, she is completely borstal!!
by jimro & dale October 18, 2004