When a night of overly excessive drinking ends in bodily injury and/or involuntary loss of nutrition or digestive substance. Typically this is considered losing to the attacking Bear.
It must be noted that it is possible to fend off a Bear Attack, however only the most experienced drinkers can walk away unharmed.
This term was coined by Employees wishing to discuss recent events without exposing unethical behaviors. For instance, if we were talking in a different language.
Billy Bob got "attacked by a bear" last night. It followed him around town all night but caught up to him on the highway. Be careful not to brush up against his car.