Similar to Asperger's Syndrome (which is a developmental syndrome on the Autism Spectrum categorized by social difficulties, difficulties picking up on subtle social cues, expressing empathy, and typically having a special interest area). Manberger's applies to men who exhibit many of the symptoms of Asperger's, but do not actually fall on the Asperger's Spectrum. These men are often employed in fields like engineering and computer science, and cause many women eternal frustration.
Manberger's Syndrome symptoms include (but are not limited to): inability to understand how to comfort someone emotionally rather than just offering asinine "solutions" problems, difficulties expressing emotion other than anger, frustration, and neutral, difficulties expressing empathy, difficulties behaving considerately toward others, and obliviousness to the rich social and emotional subtleties and relational connections going on around them. These men might suggest that a woman marry them just for the health insurance (because obviously getting married is about nothing more than this) or say something like "It didn't occur to me to consider how you might feel if I ate all your leftovers."