1. to complain about being poor or having little money; to claim poverty
Usage: informal; often used with 'about' or as a standalone verb
2. to speak negatively about someone or something; to disparage or criticize
Usage: informal; often used with 'about'

Examples

• He's always poormouthing about his financial situation, even though he has a good job.
• Don't poormouth the new restaurant; I thought the food was excellent.
• She tends to poormouth her own abilities, but her work is actually quite impressive.
• They were poormouthing about the economy at the dinner table.
• I wish he would stop poormouthing his hometown to visitors.
• The team's coach warned them not to poormouth their opponents before the game.