That sounds like a homing shot!

Inputs: I autofired the 4 D pad directions simultaneously and repeatedly. This seems to work in every lobby I've tried it in, but nowhere else. Possibly only works if near B Locker's area, but B Locker himself can be cleared. Does nothing as far as I can tell but really, really, really weird.
Edit: I always suspected this was a scrapped developer cheat. I was kind of right - but it wasn't scrapped at all! More details elsewhere, but basically this is the start of a code that lowers the number of golden bananas required to clear B. Locker.

[@goldiethecat210]

He has ascended

[@catstorm26]

Have you found the secret debug input code or what

[@Ballaam]

Yes

[@catstorm26]

My god it really is the debug code

[@loganclapp2940]

be careful, dk

[@PurpleRupees]

Looks like regular DK64 to me.

[@Kosmicd12]

Why

[@MrSparkle404]

He's finally back.

[@user-ds3hb5iq7h]

And about time too

[@missingno.8809]

Maybe it's the sound of a old debug lobby-oriented option?
I often see a weird sound being put as an debug-option is activated, maybe they removed the function but not the activating sound - since it would be almost impossible to reproduce on a vanilla N64 controller it go past the tests.

[@Frank_Erz]

Thanks.

[@LANBobYonson]

seems normal

[@absolutetrash7880]

Bout right =P