purple thunder is an underground army created by two high schools students. it is the second largest underground army. Members will usually yell purple thunder in a loud deep raspy voice to show they repsect their membership.
When, after consuming too many blue-raspberry smoothies and cabbage, one breaks wind loudly and leaves a distinctlypurple stain on one's undergarments.
Proven by a team of highly trained nuclear physicists to be the greatest band to ever have lived. Bring ladies out of their seats and get naked in under 3 seconds. Truly jizztastic.
Tim: Holy gosh the purple thunder cobras just blew my ear drums out of my ass in a shocking flash of lightning explosionivolcanocho