To pour hot water over used coffee grounds to squeeze an extra cup of coffee out of them.
True shermanizing is accomplished only when the coffee runs out and you don't want to bother brewing another pot for someone else, so you give him shermanized coffee and pretend it's the remains of a full-strength pot.
A Shermanite or Shurmanite is a person from a race that resembles Sherman Peabody from Mr.Peabody and Sherman, or that is not or anti-aryan, Anti-Zionist and Anti-Shrekist. A person of this could white, black, brony, wabac warper, homosexuals, leftist or disabled. A person with red/orange, orange eyes and often wears glasses is called and a Shermanite or Neo-Shermanite. Shermanites are also anarchists.