The term "flex" has multiple meanings depending on the context. Here are some of the most common meanings:

• To bend or move muscles: Flex can mean to bend, especially repeatedly, or to move muscles so as to cause flexion of a joint. For example, "He flexed the muscles of his right arm."

• To show off or exaggerate accomplishments: Flex is an internet slang expression that conveys arrogance or insincerity. It refers to showing off or exaggerating accomplishments. For example, "Shes flexing on her haters by posting new photos of her beautiful family."

• An act of bragging or showing off: Flex can also mean an act of bragging or showing off. For example, "The four-way stretch spandex works in the back of the knee to promote a comfortable flex."

• To behave proudly: Flex can mean to behave proudly. For example, "He was flexing his muscles in front of the mirror."

• To escalate a sexual situation: In some contexts, flex can mean when a man meets up with a woman with the intention of escalating the situation sexually with the goal of getting laid.

It is important to note that the meaning of "flex" can vary depending on the context and the audience.