To get stoned or high as fuck. Or to act in a manor that some might describe as down syndrome or kilt.
All of the realboys got rooned after they smoked weed.
by RealBoyCoppock August 21, 2011
2 more definitions
To intentionally wreck, break, destroy or ruin.
The thread was rooned by some assmeg at FFtoday
by DaBeerz April 01, 2003