1:dude, did you hear about that lizze girl? 2:no what she do? 1:dave reckons she's come upon the town 2:no way
basically to become a [prostitute] its a really old fashioned way of saying it and it was in the book [pride and prejudice]
"1:dude, did you hear about that lizze girl? 2:no what she do? 1:dave reckons she's come upon the town 2:no way" What is the definition of "come upon the town"?