When you almost get laid, and at the last second get turned down for doing something stupid.

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.

when you are trying to make it to the bathroom, but shit in your pants before you make it to the toilet.

A fail or mistake of epic proportion

a couple playing with each other, especially each other's sexual organs

Its when the person you love can't stay with you because they can't keep there happy sack tied down to you while still remain in love with you.

When a female is receiving sex in the doggy style position and her partner becomes overzealous and slips his wang into her pooper.