To "dumbfend" (v.) is to illogically defend an argument.
Example: When asked why he voted for Trump, Billy Bob dumbfended his actions.
A "memester" is a person who consistently uses memes to make a point rather than type out a explanation. This person is usually semi-literate.
The memester was unable to defend his point about patriotism in writing so he posted another picture of Trump wrapped in the American flag.