An 18-year-old man who thought he was meeting up with a woman outside a store in Ocean County to sell sneakers and clothing last week instead got doused with gasoline and robbed, authorities said. The man later told police a woman contacted him on Snapchat saying she wanted to purchase items he was selling, Manchester police said in a statement. When the man arrived at Dollar General on Route 37 in Manchester on Thursday, a woman poured a water bottle filled with gasoline on him, held a butane torch near him and ordered him to surrender his possessions, police said The man handed over the clot…