High-five (verb)

1. To slap the palm of one's hand against that of another person as a sign of agreement or congratulations.
2. To acknowledge or celebrate something by slapping the palm of one's hand against that of another person.

Origin:

1970s: high five, apparently a humorous alteration of "give me five", i.e. "slap me five" (referring to the five fingers of the hand).

Examples:

1. They high-fived each other after finishing the project.
2. He high-fived her after she passed her driving test.
3. The team high-fived each other after winning the game.
4. They high-fived to celebrate their success.
5. The two friends high-fived in congratulations.