exclamation. A more motherly, saintly, and motorbikey version of "holy shit!"
Related terms: holy mother of Theresa, sweet mother Mary on a motorboat, oh mother of Mary Magdalene and the motorbike she rode in on, holy shit on a stick, sweet merciful Buddha on a crutch, holy freakin' Christ in a Christmas tree, Jesus H. Christ on a popsicle stick.
Real citation: "Mother Theresa on a motorbike.
Is there anything is the known world hotter than Lena Olin in leather? How am I supposed to get any work done?"
(quotidian, "The Rambaldi Files: Speculations with Spoilers," May 16, 2005, Television Without Pity, http://forums.televisionwithoutpity.com/index.php?showtopic=3113402&view=findpost&p=2964996)
Made-up citation: "Sweet Mother Theresa on a motorbike! I have to take a cheese whiz."