It means “immediately” or “from the very beginning.” It’s a term from racing. The place where the horses start is called the gate. “Right out of the gate” means “immediately after leaving the gate,” so we use that to mean “from the very beginning “ or “immediately.” It’s not incredibly common, but you do hear it sometimes. For example, “I could tell right out of the gate that she was going to be trouble.” That means “I knew as soon as I met her that she was going to be trouble” or “I knew from the very beginning that she was going to be trouble.”

Hi! It means immediately! Good luck!

Hello, I think it means 'immediately' or 'straight away' examples: She started planning her wedding right out of the gate, a few days after he proposed. Eric woke up after a long night’s sleep and right out of the gate he had terrible stomach pain. The phrase might originate from horse racing when a race horse runs or bolts quickly out of the gate (set up before a race begins). I honestly have never used such a phrase in conversation.