Eat a Richard - You're telling someone to swallow a big meaty thing because

You're telling someone to swallow a big meaty thing because Richard is just a long word for a cock.

My teacher said, 'Eat a Richard, you little meathead!' for talking too much.

My sister told me to 'Eat a Richard' because I spilled juice on her phone.

My dad said, 'Eat a Richard, you little runt!' because I took the last donut.