To be cut off durning a sentence by a good friend; ie. Changing the subject quickly
Russell was telling us how much in love he was with Holly when Keith speaks out loudly "How about some of that Whitesnake". Damn, Russell just got "Whitesnaked"
To "do a whitesnake" is the act of leaving your friends or colleagues at a bar or club and not tell them your leaving.
This is done in order to bypass lengthy goodbyes or to avoid a peer pressure situation to stay and consume more alcoholic beverages when you just want to go home.
A usual tactic is to excuse oneself to use the bathroom and then not return.