A device used to stretch ones navel to a desired gauge, either for the purposes of being enjoyed as an alternative copulatory orifice OR for the creation of a pouch used to smuggle drugs, weapons, etc. into prisons, high schools, and airports. May also be used to refer to such a modified belly button.
some gay guy: "Ouch ouch!! Not so fast--you KNOW I have a small vuckle!"
other gay guy: "That's not the only thing that's small on you, sugar, are you even IN my vuckle?"
The field of study concerned with the theory and technique of measuring the umbilicus.
Used especially with regards to the body modification practice of pandoto, whereby the navel is stretched to create a vuckle. Omphalometrics is concerned with measuring the the volume of a vuckle and the distance between vuckle and cock with the general aim of matching two (or more) vuckers by ergonomic compatibility.
Brian and I get along great but are challenged when it comes to omphalometrics: we both have big cocks but he's new to pandoto and his vuckle's barely bigger than the average navel.