A term used by Israelis, which is used when someone wants to quickly (and often very bluntly) get to the point. Tachlis is all about efficiency and getting to the best solution or the point as quickly as possible, without concern for feelings or flowery language.
"I saw the report you sent out, tachlis, I think you missed the point. You should redo it."
"I met a nice guy the other night... tachlis, I'm pregnant, what do I do?"