Surprise Buttsecks: To make an unannounced transfer from the pink to the brown during vigorous intercourse.
Amy: Jessica, I couldn't tell if you were getting the best lovin' of your life or a root canal last night! Were those screams of pleasure or pain?
Jessica: [blushing] Both. Dognheat gave me surprise buttsecks last night! And I can't believe you heard me, because we were in the car!