Bantwerp is simply a variant on the city names Antwerp. It refers to a trip to Antwerp that is filled with the most hilarious banter you could possibly imagine. It is also mainly used in the follow context to reaffirm the level of banter.
Person A: Bantwerp? Person B: Bantwerp!
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"Better than you" - a group of people at your school or place of work who consider themselves better than you because they are a) richer or b) really far up their own ass.
The BTYs are complaining that their tennis court needs resurfacing
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