Gateanime-com-b-nng-51-bd-1080fhd-mp4 -

: The "b-nng" is also a common abbreviation for this series.

However, the term you provided——could refer to a few different things depending on which series it's actually from. Most likely, it corresponds to one of the following: gateanime-com-b-nng-51-bd-1080fhd-mp4

: The "b-nng" often refers to Black Clover in some file-naming conventions used by anime sites. : The "b-nng" is also a common abbreviation for this series