Acting stupid on purpose, for either comedic effect or just plain annoying someone. A portmanteau of intentional and dense, for intentionally dense.
A: Be sure to be there at 5:00PM.
B: What time should I be there?
A: 5:00PM
B: Yeah, but what time should I be there?
A: ... You dumbass.
B: I was just kidding, it was indensional.
by Ghede April 27, 2010

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