-did you see trisha's backne yesterday???  -yeah, who didn't? she must not know, or something
like the well-known and well-dispised acne, backne is a skin condition in which pores become clogged and infected easily, due to massive oil production, hormones, and/or poor hygiene
"-did you see trisha's backne yesterday???  -yeah, who didn't? she must not know, or something" What is the definition of "backne"?