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A Gal-ism is when someone throws a random comment or metaphor at you that has nothing to do with the conversation and sounds like they just woke up from a nightmare.
'I'm not mad, I'm just disappointed in your life choices.', said during a discussion about pizza toppings.
'This is like fighting a chicken in a snowstorm.', while talking about a missed bus.
'You’re the reason I still have a 2 a. m. snack routine.', in the middle of a debate about who’s better: cats or dogs.