It could also mean how big of a surprise or disappointment his dick is in size.
OMG! He knows how to work it! He was so a 8.5 on the dick-ter scale.
Let me tell you, John may not have an ass, but he makes up for it in the front. He is at least a 9.5 on the dick-ter scale.
Oh yeah, I had a one night stand with that guy. From what I remember, it wasn't worth it. He was like a 2.0 on the dick-ter scale.
Did you see that bulge in that guys pants? Looks like he could cause some serious damage with thing. He must be like a 8.5 on the dick-ter scale.