"Salad dodger" - you can be very fat and eat salads, or thin and rarely eat them (many people who are overweight like salads but put things like highly calorific dressings on them)
Referring to diabetes as "beetus" or anything high in sugar as a "beetus bomb." Sugar doesn't cause diabetes.
Any review of perfumes, body products, etc. on US-based sites will invariably contain someone saying "it smells like a Jolly Rancher candy!" if the scent is even vaguely fruity, especially if it's watermelon. Not everything in the world smells like Jolly Rancher! (My American fiancé says people automatically think of that because Jolly Ranchers have a strong smell, but still, I think it's silly)