See my sig for my take on it.
It originated in several short-lived threads speculating about future Pi features. Some of the contributors were ill-informed about both technology and the objectives of RPF. After several wild, extravagant suggestions were made, someone would request a Pink Pony and a Unicorn. The threads concerned would be locked soon after.
"Thanks for saving my life." See https://www.raspberrypi.org/forums/viewtopic.php?p=1327656#p1327656
“Raspberry Pi is a trademark of the Raspberry Pi Foundation”