Definitions
1.NounA member of an online subculture of people (mostly men) who define themselves as unable to find a romantic or sexual partner despite desiring one.
2.NounAn individual who is not sexually active despite having such a desire.
3.NounA misogynistic man, with the implication that his misogyny makes him undesirable to potential partners, thus limiting his romantic and/or sexual prospects.
4.Noun"Involuntary celibacy": the state of being not sexually active despite wishing to be."(The addition of quotations indicative of this usage is being sought:)"
5.AdjectiveNot having sexual relations despite wishing to.