Bum/bʌm/ Definition 1 of 4Pro Tip 1/3Negative Connotation Describes someone negatively for laziness and reliance on others. Don't be such a bum—go find a job! Pro Tip 2/3Sensitive Usage Some may find it offensive. Use with caution in social situations. It's rude to call someone a bum for needing help. Pro Tip 3/3Colloquial Informal and best suited for casual conversation, not formal settings. In casual talk, he might be called a bum.