What does "voiced" mean to you?

The term is “typically” used in reference to speakers. A designer will have a vision as to how their speakers should sound. The designer’s speakers can sound best with either tube or solid state amplifiers; therefore, they are “voiced” with said amplifier in mind. Some speaker designers will take it further and “voice” their speaker to sound their best with a specific manufacture’s equipment. Example: Spectral – Avalon -MIT.

equipment tuned to sound with a certain set of colourations that the designer had in mind while designing the component(s).
All audio gear has colourations - each designer chooses his/her set.

In amps and preamps it pretty well means the designer does not know what hes doing.

What BRF said. It's mainly a speaker thing.