The act of thonking upon something that requires the utmost brainpower, exhausting all of one's abilities to thonk.
Guy 1: Why doesn't this McChicken taste like chicken
Guy 2: hmmmmmmmmmmmmmmmmm Big Thonk
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When one has to use all of their brainpower to thonk, usually when the question at hand is rhetorical and can only be answered with said big thonk.
Guy 1: "Why doesn't this McChicken taste like chicken?"
Guy 2: "hmmmmmmmmmmmmmmmmmm. Big Thonk"
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