Much like a brown eye, you spread your buttcheeks over someone's face until they see your buttwhole, but with it being stretched to the point of turning red.
"Gave my friend a red eye the other day, now he has pink eye and made me pay for medicine."
2👍 22👎
spreading of buttcheeks to reveal the bare brown butthole in someone's face
"I pranked my friend and gave him a brown eye"
"What did he do?"
"He gave me a rat tail."
49👍 56👎