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1.
a poop so big that it makes a thunderous sound. People who take a thunder dump, or TD, tend to feel a splash of water on their butts afterwards.
"Wow! I just took a huge thunder dump and now my butt's all wet!"
by your faces sibling no0b June 02, 2006
 
2.
The act of defecation, where the person has been waiting for a long time and the result is an inordinately large and powerful session on the crapper. It could possibly break the bowl.
"Jeez Jonny. I just took a thunderdump. They'll hear that in china."

"That thunderdump ruptured something inside I tell ya mate."
by Halit November 05, 2007
 
3.
A violent bowel movement, usually loose, which the person may have been storing for some time due to lack of access to ammenities. Propelled by a buildup of gas caused by the fact that a fart during this time would have resulted in a follow through.

It is characterised by shitting out your entire lower colon (and, possibly, a kidney or two) in the space of 2 to 3 seconds.

The result leaves the thunderdumper feeling up to half a stone lighter, noticeably weak, but relieved.
Holy crap, I just had a major thunderdump! That was a three flusher!!
by GatoMuerto September 23, 2011
 
4.
to give shock knowledge to someone, to shock them with your information, to enlighten them with new information
"I will lay down some thunder dumps on you." "Here is a thunder dump for you"
by allstarbliss May 30, 2012