It's likely a humorous or informal term.
It might be used to describe:
* A professor who is known for being absent-minded or clumsy: Perhaps they frequently trip over things, bump into furniture, or generally seem unaware of their surroundings. The "gurney" part might be a humorous reference to needing to be transported on a medical stretcher.
* A professor who is very passionate about their work: They might be so engrossed in their research or teaching that they neglect basic necessities, like eating or sleeping. The "gurney" part could be a joking exaggeration of their dedication.
* A professor who is older or frail: The term might be used in a lighthearted way to describe a professor who seems more comfortable sitting or resting, perhaps needing a gurney to get around.
It's important to note that this is speculation, and the actual meaning could be different depending on the context and the people using the term.
If you heard someone using the term, the best way to understand its meaning is to ask them directly.