A sexual act. The male, or appropriately equipped individual, performs doggie-style coitus on their partner. Upon nearing climax said individual will grasp the sheets, or bed coverings, and display them as they are wings. This individual begins to flap their newly acquired, "wings." This individual then squawks, simulating the sound a Pterodactyl makes while completing the process of coitus.
I went full Pterodactyl on her ass last night.
I tried to give her the Pterodactyl but she flipped out when I started flapping my sheet-wings and screaming.
