A colloquial term used to replace "high" or "stoned." Helpful when texting multiple people at the same time and you are worried that you might inadvertently text the wrong person about yo drugz. If you DO text the wrong person, they won't know what beavered means, and you can play it off as an auto-correct problem or whatever.
You accidentally text your parent instead of a fellow stoner:
"Hey, you want to come over and get beavered?"
"What does beavered mean?"
"Oh, sorry. I meant 'Do you want to come over and get brunch?'"