1.) the act of smartly being dumb
2.) finding loopholes
3.) being a man
a female on facebook posts a status "boys are stoopid" a male friend quickly counters with a dim-witted comment "Well good thing I'm a man and not a boy."
this is an example of being Dumb Smart.
Someone who thinks they know a lot, and tries to talk like they're smart, but when engaging in debates, they never prove their point.
Fundo thought he was engaging in intellectual conversation with the smartest lady in the world, until he found out she was only dumb smart.