sneak-drink

To consume a beverage in a sneak-like fashion. The art of sneak-drinking is one that is difficult to perfect, but has a remarkable amount of payoff. There are numerous situations in life where normal drinking is strictly prohibited—in these common dilemmas, sneak-drinking will assist one in obtaining the necessary amount of liquid he or she needs in order to continuely perform everyday activities in an efficient manner.

Frank: "I'm totally going to sneak-drink this water."
Christina: "What? 'Sneak-drink?'
Frank: "Yes. I am going to drink it. Sneakily."