when a person is slow on the uptake ie , not getting a joke, or getting it slower than other people,
also can be used in instances when acting in a particularly stupid way. i.e. walking into a pole, or putting the cereal box into the fridge after using,
Similar to a Blonde moment
Girl on phone to boy
Girl: have you seen my phone anywhere?
Boy: erm, you are using it?
Girl: i know but i cant see it anywhere
Girl: ohhhhhhh... i just had a maggie moment