Dosser is a slang word that refers to someone who is lazy, worthless or sponging off others. Synonyms for dosser include layabout, slacker, idler, vagrant, bum, loafer, ne'er-do-well, freeloader, deadbeat and moocher. These words are commonly used to describe someone who refuses to work or takes advantage of other people's generosity. A layabout is someone who is habitually idle, while an idler is someone who wastes time. A vagrant is someone who wanders from place to place, and a bum is someone who is homeless and lives off others. A loafer is a person who is idle, while a ne'er-do-well is someone who has no ambition or drive. A freeloader is someone who takes advantage of others, and a deadbeat is someone who refuses to work and pay their bills.