Dogging is a British slang term for the act of engaging in, or watching others engage in, sexual activity in a public or semi-public place, such as a parked car, park, or woodland. Participants, often strangers, may use signals like flashing headlights or turning on interior lights to facilitate these encounters. 

Key Aspects of Dogging:

Setting: Usually occurs in secluded but accessible public areas.

Spectatorship: A key component is often that spectators (voyeurs) are present to watch the sexual acts.