Love is a wildly misunderstood although highly desirable malfunction of the heart which weakens the brain, causes eyes to sparkle, cheeks to glow, blood pressure to rise and the lips to pucker. - Anonymous
Garlic
Vegetable which is excellent for avoiding cold germs. Eat enough of it and people with colds will stay far away from you. Of course, so will other people.
It is not a definition more like a word-joke, but was reminded of it from your one-liners.
What's the difference between a dirty bus stop and a large-breasted crab? - One's a crusty bus station, and the other is a busty crustacean.
This is one of the bests. I like one liners or playing with words that are similar too each other and saying them also out loud can be really funny too.
Bar-be-que
(bar•buh•Q) n. You bought the groceries, washed the lettuce, chopped the tomatoes, diced the onions, marinated the meat and cleaned everything up—for the dinner he made for his friends."