Bender/ˈbendər/ Definition 1 of 4Pro Tip 1/3Colloquial Usage Used informally, often among friends referring to heavy drinking. After breaking up with his girlfriend, Mike has been on a bender. Pro Tip 2/3Negative Connotation Implies excessive or uncontrolled alcohol consumption, usually seen in a bad light. Her bender left her with a massive hangover and a lot of regret. Pro Tip 3/3Not Professional Avoid using 'bender' in formal or professional contexts; it's casual speech. I can't come to work, I was on a bender this weekend.