The need to excuse oneself from festivities and goings-on and retreat to the bathroom, typically to make use of the facilities. Often done alone, although women have been known to take bathroom breaks in packs.

Usually the breakee taps the person seated next to him/her and says "I'll be right back, I need a bathroom break," and then stands and quietly departs. If anyone asks, "Hey, where'd (name) go?" the person whom the breakee spoke to will say "Oh, s/he needed a bathroom break."

Truly one of the finer points of casual ettiquite. This method is much more appropriate and much less crude than standing up from the group and announcing your intention to drain the lizard or some other colorful euphemism. Discretion is the better part of valor, after all.