zunking

Going into a Subway while screaming the phrase “ZUNKY ZUNKY ZUNKY” repeatedly and ordering a foot long sandwich, and then going to the public restroom (if the given Subway has one) and fully inserting the sandwich into your anus while, again, repeatedly screaming the phrase “ZUNKY ZUNKY ZUNKY” loudly enough for all customers and employees to hear.

Person A: Wanna go zunking at Subway later?
Person B: Sure, what ingredients are you gonna put on yours this time?
Person C: ZUNKY ZUNKY ZUNKY