if someone is used as a guinea pig, new ideas or products are tested on them.

They're looking for volunteers to act as guinea pigs for a new AIDS vaccine.

• whale of a bill
• whale of a difference
• whale of a job
• whale of a party
• whale of a problem
• whale of a something
• whale of a story
• what beats me
• What don't know won't hurt .
• What don't know won't hurt you.
• what do you know
• what do you know!
• whatever floats boat
• whatever floats your boat
• Whatever turns on.
• Whatever turns you on.
• what is driving at
• what makes someone tick
• what makes tick
• What planet is on?
• What planet is someone on?
• what price
• What price ...?
• What price fame?
• What price [fame/success/victory etc.]?