1. A fat person whose thumbs are abnormally bloated and chunky.

2. One whose thumbs have become large and muscular from frequent thumb wrestling or text messaging.
1. When that porker over there grabbed my arm, I could feel her thunder thumbs crushing my bones. Oh the humanity!

2. Yeah, just try to beat Old Thunder Thumbs over there in a Thumb Wrestle. Just don't come crying to me when he breaks it! He'll lay the Opposable Smack Down on you!
by A Fizzle Dizzle July 24, 2008
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