Maybe someone saw me getting out of the truck and the bar, and THINKS I'm the HOOKER!!! I think it's a little jokingly way of saying don't drive the company truck to a bar. If it was more serious, then I'm sure he would have talked to you privately for one of those chewing out sessions. Another scenario about us, would be perhaps he thinks he let the ladies borrowed your truck. *Shrugs*
If he makes another joke or hint, then perhaps talk to him privately about it, but for now act like you normally do toward him.
