Eat a peach
When you go down on a girl. It’s like eating a big sandwich but with a girl’s private part instead of bread and meat.
My friend said, 'Eat a peach!' after he asked me out on a date.
My dad said, 'Eat a peach!' when he saw my mom in the kitchen.
My brother said, 'Eat a peach!' when he saw my cousin in the hallway.