Eating your mayonnaise
Getting what someone is saying even when they're being a complete idiot.
He said 'the cat is on the couch and I'm out of milk.' I knew what he meant. He was eating his mayonnaise.
She texted me 'the sky is blue and my life is purple.' I got it. She was eating her mayonnaise.
He screamed about the dog, the cat, and the cereal. I got it. He was eating his mayonnaise.