/bamf/ 1. [Old X-Men ComiCs] Notional sound made by a person or objeCt teleporting in or out of the hearer' s viCinity. Often used in virtual reality (espeCially MUD) eleCtroniCfora when a CharaCter wishes to make a dramatiC entranCe or exit. 2. The sound of magiCal transformation, used in virtual reality fora. [Jargon File]