A combination of rumor and speculation; to base an idea on a very small bit of real information and build hype to a ridiculous level. A prime example of a group that is well know for rumpulations is the Apple community. They catch wind of a tiny bit of information that is "leaked" by Apple and come up with all kinds of wild ideas about the next new iPhone.
Hey, did you hear the rumpulations around the new iPhone 8? They are are going to add a new innovative "headphone" port!
by Rumpulator September 15, 2016
The act of taking a full, unopened beer can and striking it to one's own head, then making the beer explode.
Alexa: Nate you should rumpul that bud light!
Nate: Nah i enjoy bud light, but i'll rumpul that natty light for sure.
Alexa: You won't pussy!
Nate: Watch me bitch
Nate: Nah i enjoy bud light, but i'll rumpul that natty light for sure.
Alexa: You won't pussy!
Nate: Watch me bitch
by NTswelly January 29, 2012