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1.
A varient of the exclamation "oh my god," typically used to express shock or surprise. Substituting the word "rod" for "god" is a reference to the male genitalia, but does not necessarily suggest anything special about the circumstances under which the varient might be used. In general, this varient is simply used to invoke humor and is generally interchangable with the original form of the exclamation.
Bill: "And then she kicked the shit out of him! Can you believe it?!"

Ted: "Oh my rod!"
by Adam Apple February 04, 2004
 
2.
Bubble Tea fucking PWNS YOU. TEH PWNZOR.
Sammy the Cashier: OH MY ROD! OWNED! TEH PWNZOR! CAN'T FIND YOUR FRIENDZOR!
by YOUR FACE.. March 24, 2005