A bollockbrain is a simple form of abuse which has its origins in Manchester. In 2005 versions of the word began to spring up in the midwest USA; especially in Denver, Colorado Springs and Pueblo.It is usually used to make fun of someone who does somthing stupid;lacks anything resembling a brain; or to destroy someones self esteem.
*edit in name* you bollockbrain, what the fuck did you just do that for? you almost killed us you crazy motherfucker.
A bollock brain is a fuck wit.
Oi! Bollock brain, unplug the toaster before sticking a screwdriver in it to get that bit of burnt toast out.