1. practically everything there is; every possible object whether needed or not

1. When Erin went away to college, she took everything but the kitchen sink.

2. If you tend to take trips in the car, you can go for something bigger, where you can cram in everything and the kitchen sink.

3. He hit me with everything but the kitchen sink!

4. We're only going on vacation for a week, but John will insist on taking everything but the kitchen sink.