Initially an internet version of the
Wojack guy, a Coomer is a male
chronic masturbator, an Incel on steroids, who lives in front of his PC consuming porn all day, and having no other interest in life other that to reach his next orgasm.
But the meme has grown, naturally.
Coomer now refers to any young man who is solely concentrated on an almost psychopathic need to chase the next dopamine hit, be it masturbation, game score, high of any kind. Coomers are now utterly useless self-pleasuring addicts, to the
exclusion of any future career development or frankly any future plans at all beyond the strict need feed their addictions.