The opposite of Obfuscating Stupidity: A stupid character pretends (or tries to pretend) he or she is really smart or otherwise good at something. The stupid characters will either enlist a smart character to feed them lines, or bluff their way through with seemingly profound statements ("What is art? Are we Art? Is Art Art?") and Techno Babble.
Tend to show up in characters that are so dumb [...] [tvtropes.org]