[ThatHege]

If its the old taunt kill bug you mean like in some of the videos.. You need to drink and turn around while drinking animation runs and button smashing taunt at the same time so it starts just when you're turning around.

Remember to make sure sandman was your last selected weapon before changing to bonk.

Thats atleast how it used to be done.
I wouldn't be suprised if it were patched though as useless as it was.