Street name for BGBH, a "designer drug" related to Scopolamine. Commonly termed "rusk" because of its supposed ability to reduce americanyouth to an infantile state.
An action that is so risky you can no longer call it a risk, it is a mix of the words "russian" and "risk",(russian being that Russia is known for risks)
Ted: hey,let's cliff dive 79ft tomorrow
Larry: I don't know about that,it's kind of a rusk