Slob (noun)

1. A person who is lazy, dirty, or unkempt in their personal habits and appearance.
2. A person who is careless or neglectful in their responsibilities, duties, or tasks.

Origin:

Of uncertain origin, though possibly derived from the yiddish word 'slob' meaning a thick, heavy, or clumsy person.

Examples:

1. She was embarrassed to have her friends over because her roommate was such a slob.
2. He was called a slob by his boss for consistently failing to meet his deadlines.
3. She felt like a slob because she hadn't showered or changed her clothes in three days.
4. The house was a mess because the slob who lived there never cleaned up after himself.
5. He was ashamed of himself for acting like such a slob and promised to change his ways.