Hook-up has several meanings:

Making a connection between components in a system

• An electrical connector

• A connection to water, sewer, or electrical utilities at a campsite

Meet up, or making a connection between people

• Slang term for courtship, especially of short duration

• A one-night stand

• Casual relationship or casual sex

• Hookup culture

• In urban slang, a discount

• In urban slang, a drug dealer

Arts and entertainment

• Hooking Up, a collection of essays and short stories by American author Tom Wolfe

• "Hook Up", song by Dawn Raid All-Stars 2004

• Hooking Up (film), a 2020 American comedy-drama film starring Brittany Snow and Sam Richardson

Other

• Hook-Ups, an American skateboard brand