It's like the world's
fattest CUCKOO clock.
The Big Bang Theory Season 7, Episode 23
By that standard,
Penny is CUCKOO for Cocoa Puffs.
The Big Bang Theory Season 4, Episode 9
I always thought
I was more like a CUCKOO bird.
The Big Bang Theory Season 1, Episode 15
I thought it ended at CUCKOO.
The Big Bang Theory Season 1, Episode 15
The newly hatched CUCKOO
eats all the food...
The Big Bang Theory Season 1, Episode 15