Bunyak has only had one meaning, but like most cultures, it can be affectionately used
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A Bunyak is quite frankly an Idiot/fool, but that idiot is a Ukranian idiot.
My Dad used to call us all Bunyaks when we got impatient as kids. "Chikai-Chikai Bunyak" means "hold your horses you fool" or don't get your shit in a knot, moron.
The act of dipping the tip of a penis in a bowl of guacamole (preferrably from chipotle) for a number of times until an ejaculatory satisfaction is met.
"Your 20 minutes late. Where were you?"
"Sorry I got some Chipotle and after the diarrhea I had some leftdover dip. So I tried to buguake but the chip crums were too sharp."