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.

An abbreviation for Time To Penis. Used by game developers and graphic designers as a way to describe how long it will be before the players or users find a way to represent penises in the game. These could either be chat or text descriptions, static images, or even animated penises.

TTP stands for Tight Teen Pussy. It refers to women in the age span of teens to late 20's. It defines extremly hot women that you would immediately want to have sex with. Can be used without detection amongst crowds and feminists.

T.T.P is short for "Turn To Page".
You most commonly find them in shared school textbooks.

Military abbreviation for "Tactics, Techniques, and Procedures".

Usher (RnB/HipHop Artist Artist) used T.T.P as a name of one of his songs, as far as i can tell from the way it is used, and other lyrics in the song, it means Total Package.