This is a parody of Katy Perry's song I Kissed A Girl.
This is from the episode Pirates of the Neverland: At Wit's End / Batman Family Feud.
Summary of Skit
MAD takes a look at the top 5 the things Katy Perry kissed but hated.
Announcer: And now, the Top 5 Things Katy Perry Kissed But Didn't Like! A porcupine...
Katy Perry: Ow!Porcupine: Eww, is that cherry lip gloss?
Announcer: Tapioca pudding...
Katy Perry: Ow, feels like fish eggs.
Announcer: Fish eggs...
Katy Perry: Feels like tapioca pudding!
Announcer: A mousetrap...
Mouse: Whew! Thanks, Katy!
Announcer: And the Liberty Bell.
Katy Perry: Ew, I kissed it on the crack!
Liberty Bell: Hehehehe.
- Innuendo: When Katy Perry says "Ew, I kissed it on the crack!", it's similar to "Kiss my a**".