big thonk
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
Guy 2: hmmmmmmmmmmmmmmmmm Big Thonk
Big Thonk
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"
Guy 2: "hmmmmmmmmmmmmmmmmmm. Big Thonk"