What is Batty Bus?
The "Batty Bus" is the nickname for the double-decker busses( mainly yellow and/or orange, and commonly the service 104. It is named so because it mainly carries students from devonport High for boys, an all boys school which many people believe mean they are gay. So that's why we call 'em battys
Person one: Did you see that guy on the batty bus stick his middle finger up at us?
Person two: Yeah, we're gonna egg 'em tomorrow.