Vet clinics often have litters of kittens to raise. Either they’re too young for a shelter, too sickly, or the clinic intends to adopt them out when they’re big enough. Whatever the reason, nurses often end up raising kittens and giving them ‘temporary’ names.
The intention of these temporary names is that if you give the kitten a stupid name, you have something to call it other than ‘the middle black male’, but because it’s a stupid name you wont get emotionally attached and end up keeping it. Again.
Which is how some nurses end up with cats that have names like ‘Flea bus’ and ‘Trash bag’.