The banter bus is a metaphorical term used to describe the activity of going to a place of interest with banterous intent usually some sort of clunge fest. It could also be used to ask someone if they want to partake in some meta-wymsical behavior.
I am on the banter bus now I'll be at the clunge fest in 20 minutes.

What you doing tonight mate? You up for getting on the banter bus.
by stupidgrin69 October 25, 2010
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