Rocket Thunder is/was a group name given to Melee Hell, a popular gaming group on Facebook.
Although Melee Hell is specifically known as a shitposting group with relevance to Super Smash Bros. Melee,

Some jackass decided to change the name to be about goddamn stupidass rockets and thunder and shit.
Hey man, Did you see that new post in Rocket Thunder? That Marth really grabbed that Fox McCloud!
by redgazelle April 15, 2020
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The pocket rocket thunder dome is a sexual move in which you let your girl friend sit on your friends lap whilst massaging her *AHEM* once she starts to get really loud you let your friend have his way with her,until she passes out,after that you let her sleep in her own puddle of fluids whilst you take out a condom and blow it up to look like a rocket and piss in it,then shove it deep inside her and burst it
Friend:dude your gf looks super tired and worn out
Prtd guy:oh yea,we tried out a new sex move called pocket rocket thunder dome,and she loved it,best move out there
by Ahaha_youthot1 January 4, 2022
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