Carpool: 'world's fastest hot tub' The word carpool normally conjures up images of a boring commute polluted with shoptalk, but in this case we refer to a literal hot tub on wheels. Just add bikinied babes. July 16 2014 at 02:50pm Related Stories Comment Guidelines Please read our comment guidelines. Login and register, if you haven’ t already. Write your comment in the block below and click (Post As) Has a comment offended you? Hover your mouse over the comment and wait until a small triangle appears on the right-hand side. Click triangle () and select "Flag as inappropriate". Our moderators will take action if need be.