When a guy is unceremoniously dumped by his girlfriend whilst still in love with her and looses all motivation in self-grooming, instead spending all of his time feeling sorry for himself and chain smoking. The result is either a large grizzly adams style bushy beard or a pathetic patchy puberty beard.
The beard is ill advised as although it fits with your new found self image of self loathing, it also makes it near on impossible to get over your ex as all other members of the opposite sex will find it and you grotesque.

From STEM, an abbreviation short for "Science, Technology, Engineering and Mathematics", a STEMlord is a pejorative term for a particular kind of person who has studied in these areas at university or works in these fields who holds a pretentious, condescending attitude to anyone who has studied in any other fields, particularly the Arts and Humanities. They typically believe themselves to be more "intelligent" and "rational", while generally remaining incredibly ignorant outside of their areas of expertise and having the charisma of a rotting pig's backside.

the very unattractive beard that guys grow for the month or two following a break up, usually with the guy getting cruelly dumped