6 o'clock 10
When a girl looks like a dime from the back (i.e. Her "6 o'clock) but is actually unattractive from the front
"Did you end up sealing the deal with that girl at the bar?"
"No. When I walked up, she ended being a 6 o'clock 10."
"No. When I walked up, she ended being a 6 o'clock 10."