v.1. To connect or attach something to something else: We'll hook up these shelves to that wall. The plumber hooked the pipes up to the shower.
2. To assemble or wire up some mechanism: Could you help me hook up my stereo? Someone from the cable company stopped by to hook the television up.
3. To meet or associate with someone: We agreed to hook up after class. He hooked up with the wrong crowd.
4. Slang To get married: We finally hooked up after five years of living together.
5. Slang To become romantically involved with someone: I joined the dating service to try to hook up with someone.
6. Vulgar Slang To become sexually involved with someone.