1 definition by Philthy Phil999

Top Definition
A nine inch angle grinder, a Big Dangerous Bastard. So named because of the number of serious injuries associated with the use of these machines. Banned from many worksites because of this.
"Hey, get that BDB off this worksite ! Nothin bigger than seven inches here without half an hour of paperwork."
by Philthy Phil999 March 29, 2010

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