where’s the poop

In How I Met Your Mother it is the phrase that Lily uses when she realizes that someone is lying or hiding something from her. The phrase is followed by the name of the person she is addressing.

A phrase that was popularised by the hit tv show how i met your mother (HIMYM), 'where's the poop?' Refers to a line used multiple times, by Lily Aldrin after it was first heard in season 6 episode 3: Unfinished. In the episode she explains that her dog used to make the exact face that Robin was making after he had pooped somewhere in the house, she then uses the term 'where's the poop?' to ask Robin what she is hiding from her, this is in direct comparison to how her dog used to 'hide' his poop.