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1.
A name given to an artical of clothing for people who fart very loud or have very bad gas.
"Stay away from Jim, he's wearing his thunderpants today."

"Thats what that retch is?!"
by bimmerjim May 10, 2005
 
2.
A person who makes a display of farting loudly, or trying to fart as loud as possible, perhaps by lifting one leg and wincing as they do it(Usually a male practice, of those aged about 14 to 20.
Hey, Thunderpants, cut it out man, my mom's downstairs and she will think I did it.
by Snodgrass December 14, 2005