What is Bender Extender?
The act of extending your previous night's bender into the next day. Usually performed after an all night drowning session, when one has had little to no sleep, and has arisen from slumber still mildly intoxicated - and most importantly - before the onset of the inevitable hangover. The bender extender will typically push back the hangover to a later date, which may be more convenient for your life.
Waking up after just 2 hours of sleep and still buzzed from the night before, Andrew filled his mug with booze in order to execute a bender extender.