2. Hitting someone or something twice.
3. Shooting something or something twice.
Pretty much doing anything twice.
2. "I double tapped him in the car"=I hit him twice in the car.
3, "I double tapped him, just in case"= I shot him twice, just to make sure.
Person B: You're such a liar, you stink of sex and rubber.
Person A: Haha, how'd you know? :phone call: Well, hey I have to jet.
Person B: You going to double tap tonight aren't you?