The emigration of freed American slaves to the newly-formed Liberia at the suggestion of PresidentJames Monroe. See also definitions above.
President Monroe faced west, bent over, placed a tube in his ass, and, with a mighty heave, blasted a freeman across the Atlantic, thereby effecting the very first Monroe Transfer.
When you take a tube of some form and insert into a persons anus then have another person insert the opposite end, into they're anus as well. One man deficates into the tube and it transfers into the opposites anus.