Where's the poop? 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.

In Unfinished, Robin was trying to hide her difficulties of getting over her break up with Don after seeing him on TV, but Lily said "Where's the poop, Robin?" and explains that when she was a kid she had a dog named Bean and whenever he made a face she knew that he pooped in the house and says that Robin just made the same face when she was lying, in which Robin dubs her a "poop sniffing dog" in which Marshall says "I think that's just called a dog."

In Canning Randy Lily used the phrase again when she asked Robin who she slept with.

Lily used this on Ted in Something New when he is lying that nothing happened between him and Robin recently.

Lily Aldrin vte
Friends & Family Marshall EriksenTed MosbyRobin ScherbatskyBarney StinsonScooterMickey AldrinJanice AldrinRita AldrinMorris AldrinGrandma LoisMarvin W. EriksenDaisy EriksenUnnamed Eriksen Child
Places MacLaren's PubLily's KindergartenWesleyan UniversityMarshall and Lily's apartmentMarshall and Lily's houseThe ApartmentLily's first apartmentLily's second apartment
Phrases Where's the poop?You sonuvabitch
Others You're dead to me lookMarshpillowIntervention bannerLily's bisexualityAldrin Justice (punishment)
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