The term "hook up" is commonly used to refer to connecting or encountering someone, often in a casual or informal context. It can imply meeting someone for a romantic or sexual encounter without any long-term commitment. Additionally, "hook up" can also refer to the act of connecting devices or systems together.
The expression "hook up" originates from the word "hook," which implies bringing two things together or securing one thing to another, akin to how hooks catch or hold onto items. It evolved in the late 20th century, particularly in the context of casual relationships.