Chugger is a derogatory term used to describe a person who approaches others in public places to persuade them to donate money to a charity. Some people find chuggers to be invasive, annoying and aggressive. If you're looking for a more positive word to describe these fundraisers, you might use terms like "charity ambassador," "donation collector," "fundraising representative" or "solicitor." Alternatively, you could describe the fundraising method itself rather than the person carrying it out by saying that you were approached by a "street fundraiser," "face-to-face fundraiser" or "penchant solicitor." No matter which word you choose, the most important thing is to remember that these people are trying to make a difference through charitable work.