A BDSM lifestyle term for an idiot that considers him or herself to be a Dominant of submissives and slaves in the lifestyle.
Wow! That guy is a dumbinant if he thinks he can tell my Dominant's submissives what to do without seeking his permission.
Any idiot that thinks he can make me submit just because he thinks he is a Dominant is really a dumbinant and a jerk
(noun) Male or Female: A wannabe Dominant in the BDSM world, easily identified and laughed at by experienced lifestylers.
A Dumbinant will pretend to know everything. A Dumbinant never takes advice. A Dumbinant thinks that dressing in leather and carrying a flogger confers automatic dominant status toward anyone who identifies as a submissive.