Dunder Cap: n \’d:(n-d;(r\ perh. fr. D dondér thunder + n \kap\ ME cappe, fr. OE cæppe, fr. LL cappa head covering, cloke

A contraction of dunce cap (1840) and dunderhead (1625).

An idiot, numb skull, blockhead or dunce. One who does not understand the obvious results of a planned action.
Ah come on you Dunder Caps! Look at what renovations to the Vinoy hotel did for downtown St. Pete! The concerts, the promotions – at Vinoy Park. Please. If that isn’t an example of how to make money on a historic downtown venue I don’t know what is. Are all of you out of work construction workers?
by Palmetto Phyllis October 25, 2011

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