
was for CUCKOO pills.
The Big Bang Theory Season 7, Episode 7

It's like the world's
fattest CUCKOO clock.
The Big Bang Theory Season 7, Episode 23

I thought it ended at CUCKOO.
The Big Bang Theory Season 1, Episode 15

By that standard,
Penny is CUCKOO for Cocoa Puffs.
The Big Bang Theory Season 4, Episode 9

The newly hatched CUCKOO
eats all the food...
The Big Bang Theory Season 1, Episode 15