The gurgling sound that comes from the upset stomach after eating large amounts of food from McDonalds.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

The uneasy feeling one gets in their stomach after eating McDonalds.

The gurgle in your stomach you get after eating Mcdonald's, usually leading to a fart, diarrhea, or possibly vomit.

The first side effect after one eats food from McDonald's. Soon to come is the McAche, McRuns, McSpits, McPuke, and finally the trip to the McRoom (Emergency Room).