Much to the chagrin of real Philadelphians, OTB people descend on the city every weekend, but they especially love the bars and clubs in Old City (possibly because they don't have to stray far from the bridge to reach them). When out of town the OTB people will say they're from Philly, but they've only actually ever hung out in Center City and maybe South Philly (but probably only near the stadiums) because they're afraid of the rest of the city.
"Come on man, don't judge our city based on those people. They're mostly OTB anyway."
'yeah she's pretty OTB'