'thunked' rather than 'thought'?

Oh no! There is no "ed" on "thunk." "Thunk" is the past tense form of the irregular verb "think."

No doubt you are asking yourself what the perfect form is. Is it "thunk" or "thunken"? The answer is that no perfect form exists. People who say "thunk" have no patience with the present or past perfect.
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Somebody tell the person who was sneering about "aluminum" to check into the science of naming elements. The ending for a metal is "um". The "i" in sodium, radium, et cetera comes from the preceding root.