Tretch is a furthur acknowledgement that something is Sketch(y) or Unreliable, It is also a combination of the word true, and sketch. And can be applied to any lame or Sketchy situation
" That police officer is going to see us smoking this sticky-icky bong rip!
This is Tretch Dude!!!!"
" That party was tretch man, there was alot of illegal activity and I felt threatened by it..."