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Shortened from the word treacherous, tretch describes something that is dangerous and if desired, cool.

Much like the slang word "sick" it can be used in both positive and negative scenarios.

In the positive sense it can mean fun, daring, chill, etc.
In the negative sense it can mean sketchy, wrong, or terrible
For example:

Positive: "Hey Demarcus, that party was majorly tretch, mann!"

Negative: "Yo man, we have to get out of here. This shit is hella tretch."
tretch by Treacherous Whore July 22, 2009
Related Words
Tetchy (tech-ey): adjective

Easily irritated or annoyed.

Synonyms: cranky, fractious, irritable, nettlesome, peevish, peckish, pettish, petulant, testy, techy.
"As a critic gets older, he or she usually grows more tetchy and limited in responses."

"z0myg0sh, the dude at that place where we did that with those people was really tetchy!"

"Not the least tetchy of his countrymen."
Tetchy by Fuzyhamster October 17, 2006
It snowed so much earlier, the roads are super treachy now.
Treachy by Gordta01 October 9, 2016
low- or dirty-minded

glancing at the idea that a person's mind is in a muddy trench, with connotations of both trench-foot and a degenerate's trench coat
When he said that a slip of the return key halfway through typing "milfoil" in an internet search would transform an invasive aquatic plant into a filthy acronym, his friend laughed and said, "Trenchy minds think alike!"

He replied, "Stop right now! I don't want to hear any jokes about olives, whales, sunflowers, safflowers, or corn."
trenchy by Elsinore Sexton June 19, 2011
Dude I'm really tetchy today, fuck off!
tetchy by jizzsports July 9, 2007

tretcherous 

Usually tretcherous is defined as something disgusting, sneaky, or plain Fucked up.
Man that bitches pubic hair was TRETCHEROUS
tretcherous by gladsbaneh March 30, 2008