The Hypernet Biblioversity Library Dictionary, 234th ed., defines "maimery" as follows:

maimery: n. Mayhem, conflagration, conflict, or applied force resulting in the loss of one or more limbs.

It should not be confused with mammary. The two words have nothing to do with each other, and have only appeared in adjacent context in those few publications low-brow enough to cover the Hefner Heir Wars of 2116 (and in this footnote, but that doesn't count.)