Top Definition
(noun) A stupid or foolish person; a dolt. Synonymous with boob.

(verb) To act in a manner that makes one look foolish.
(n) I accidentally drank laundry detergent! I'm such a Thunderguy!

(v) Wow dude you really Thunderguy'd that up.
by Absolut-Kaos June 12, 2005
1 Word related to Thunderguy

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