Question 1: "It" refers to "a great butt" He means that she wouldn't recognize "a great butt" People use this to say you wouldn't recognize something. Question 2: Ross was picturing her getting bit by "a great butt" which isn't appealing or that is absurd. He is sarcastically proclaiming that, the image is something that you don't want to see. People say that sometimes .

Q1: "if it came up and bit ya"? What is "it" = "it" refers to the "great butt" that they are talking about. Does "if" mean that "even if" here? = Yes Q2: There's an image. After he said "There's an image.", the audience laughed loudly. why? and what does "image" mean here? "Image," here, means the picture of a butt biting someone on their butt. Why? The audience laughs because the mental image of someone's butt biting someone else's butt is, supposedly, funny.