The act of not eating or not masterbating, as both are equally difficult to maintain life. The ultimate challenge to one's self...
Fapper 1: hey, not eating again? What's the matter?
Fapper 2: I am on a near good level and you are a pitiful peasant unworthy of my presence! Leave before I unleash the rage and fury fapsting has given me...
a fapstainer is akin to a fapstinent; which mean fap + abstain and fap + abstinent respectively. The terms are used in manosphere and incelosphere communities which are adjacent to the NoFap communities
fapstain is a verb coined by members of the manosphere and incelosphere that is a portmanteau of fap and abstain. Manosphere or incelosphere members thereby use the term to their fellow forum members in a form of camaraderie encouraging one another to abstain from porn or masturbation