"I smell baby shit" is a derogatory insult meant for anybody who whines about anything. It is a reference to a baby crying when it needs its diaper changed.
Tom: "Why can't this place ever get the foam on my coffee just right? I wish the cups were a different color too!"
John: "I smell baby shit."
John: "I smell baby shit."
by BitchassMcGee November 01, 2018