bamf
/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}) electronic
{fora} when a character wishes to make a dramatic entrance or
exit.
2. The sound of magical transformation, used in virtual
reality {fora}.
[{Jargon File}]