a combination of "fap" and "nightmare". a revolting/unsexy thought or situation that prevents you from being able to fap/achieve an erection/orgasm
Mike usually found some alone time while his wife was at work, but the fat,dead homeless man that he found in his computer room this morning was such a fapmare that he could never spank it in there ever again.
by masochistmonkeyjoe April 22, 2009
by Knofap August 10, 2017