Running naked in a public place as a prank or a dare.
Streaking is usually seen as funny or shocking, and it can be against the rules.
Examples:
He is streaking through the park.
Streaking is not allowed at the school.
She saw someone streaking at the game.
The police officer was surprised to see someone streaking.
Streaking is never allowed at the museum.
I saw a funny movie about people streaking.