It is disarmed, ramshackle, although its use is a bit vulgar as it intersects with a box in its genital meaning, like a parallel with dismral. But its origin would be in 'untapped', a very rare verb to "do not box the fittings in the wooden furniture", which leads to them being easily ramshackle. See drawer, pick, unconch ( in the sense of breaking the shell 128521; ) .