Trench gash is a medical condition caused by prolonged exposure of the gash to damp, unsanitary and cold conditions.
The affected gash may become numb, affected by erythrosis (turning red) or cyanosis (turning blue) as a result of poor vascular supply, the gash may begin to have a decaying odor due to the possibility of the early stages of necrosis setting in. As the condition worsens, the gash may also begin to swell. Advanced trench gash often involves blisters and open sores, which lead to fungal infections; this is sometimes called tropical ulcer (jungle gash).

Personified by, a big sweaty rotten cunt.

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.

A girl who is dirty, and sleeps with everyone, also known as a get around. She is ugly, and you hate her, so you simply insult her with trenchgash.