A phrase commonly used by the fandom side of the social media website tumblr to describe a reaction of an inhuman noise (that sounds like a pterodactyl screech) one has made after they see something that pleases them greatly and instantly excites them.
Three men in pterodactyl costumes orally and vaginally pleasing a woman. Something that must be experienced to truly understand. God's gift to this humble earth.
When a man is doing a woman 'doggy-style' and prior to ejaculating, grabs the sheets or blankets off the bed and flaps them like wings while trying to imitate the sounds of a pterodactyl in order to frighten the woman so that her vagina contracts and his orgasm is more intense.
I don't think I'll be seeing much of her anymore, she didn't appreciate the Terre Haute Pterodactyl I laid on her last night.