1. [generalization of 'Honeywell Brain Damage' (HBD), a theoretical disease invented to explain certain utter cretinisms in Honeywell Multics] adj. Obviously wrong; cretinous; demented. There is an implication that the person responsible must have suffered brain damage, because they should have known better. Calling something brain-damaged is really bad; it also implies it is unusable, and that its failure to work is due to poor design rather than some accident.
"Only six monocase characters per file name? Now *that's* brain-damaged!"
2. [esp. in the Mac world] May refer to free demonstration software that has been deliberately crippled in some way so as not to compete with the commercial product it is intended to sell.