the dwindling of the ol' "urge to merge" with old age; a decrease in one's sexual appetite in old age.
My great uncle Bucksnort did not display any signs of obsolagnium whatsoever. At age 96, he was putting the blocks to Aunt Mabel like a jackrabbit on steroids.
by weave September 21, 2003
Get the OBSOLAGNIUMmug.