gash

Etymology 1

Alteration of older garsh, from Middle English garsen, from Old French garser, jarsier (Modern French gercer), from Vulgar Latin *charaxāre, from Ancient Greek χαρακτήρ (kharaktḗr, “engraver”).

noun

1. A deep cut.
   Vowing that he was “never going to forget the lessons of that day,” President Bush paid tribute last night to the victims of the Sept. 11, 2001, terrorist attack, laying wreaths at ground zero, attending a prayer service at St. Paul’s Chapel and making a surprise stop at a firehouse and a memorial museum overlooking the vast gash in the ground where the twin towers once stood. 2006, New York Times, “Bush Mourns 9/11 at Ground Zero as N.Y. Remembers”, http://www.nytimes.com/2006/09/11/nyregion/nyregionspecial3/11bush.html?hp&ex=1158033600&en=e468f88da52557ed&ei=5094&partner=homepage
2. (slang, vulgar) A vulva.
3. (slang, uncountable, offensive, derogatory) A woman.
   "Will you bastards quit singing the blues? You're young, and there's plenty of gash in the world, and the supply of moon goes on forever," Simonsky said. 1934, James T. Farrell, chapter 19, in The Young Manhood of Studs Lonigan
4. (slang, British Royal Navy) Rubbish, spare kit.
5. (slang) Rubbish on board an aircraft.
6. (slang) Unused film or sound during film editing.
7. (slang) Poor-quality beer, usually watered down.

adj

1. (slang) Of poor quality; makeshift; improvised; temporary; substituted.

verb

1. To make a deep, long cut; to slash.
   My leg got gashed.

Etymology 2

From ghastful, by association with gash.

adj

1. (UK, Scotland, dialect) ghastly; hideous