internet slang for "strong to quite strong". used to scale awesomeness or probability.
"dude, did you hear wild bill fadunked a girl last weekend?"
"yeah man, stqs for sure. i didn't think he had it in him."
"what are the odds you think we can finagle our way in for free?"
"stqs, but we'll have to get hammered first. i'm way more friendly when i'm hammered."