In Sri Lankan colloquialism, this is a derogatory slang term often used to refer to sex workers or individuals perceived as such. "Numbers": Refers to phone numbers or contact details.

Badu Numbers operate on a shared basis. You will wait until the vehicle has 4-6 passengers (or a mix of passengers and small badu – goods). You will pay a fixed, very low rate (usually LKR 50 – 150 as of 2025, depending on distance).