One of those slap your forehead moments when you realise that you've just done something incredibly stupid.

The moment when something "dawns on you" and "the penny drops.
A dohment is when you realise that you've put the baby outside and tucked the cat up in the cot for the night.

or

A dohment is when you wonder why the lawn isn't looking any better then notice that you haven't engaged the lawnmower blade.
by la_spice August 4, 2009
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