A commonly used expression to reference a situation where things are ambiguous or unclear. Sometimes meaning "to push the envelope" or test the boundaries of acceptability.
The "lines" are personal boundaries a person designates in his/her sexual life. They usually only appear "blurred" to men who don't comprehend the meaning of "no."
Girl: "Hey, I don't think I feel comfortable with that."
Robin Thicke: "Just let me liberate you... I know you want it... I hate these blurred lines."
Girl: ".....Creepy."
Gay guy 1: "I don't know if I'm ready for that."
Gay guy 2: "You invite me over, and now you don't want to hook up? Gosh, what's with these blurred lines??"
Sister: This meeting was to discuss the rough draft of my essay, where we discussed the subsidiary questions I added in my rough draft. We also discussed the relationship between my main title and the real-life situations I chose to use in my essay. We discussed the structure of my essay as well, specifically the Math AOK section and how it relates to the contradiction of the title. This second meeting was particularly helpful in discussing the implications of my essay claims and how to apply the title across various areas of knowledge. There were many sections of the essay that could have been cut down in wordiness and the ways of knowing required further and more in-depth analysis.