Def1: A turtle whose head looks like a slimey penis, and can retract said head inside its shell. Other female animals will mistake this turtle for a phallic protrusion, and begin to mate with its head.
Def2: A cyst on one's inner butt cheek that grows hair like Don King and smells like a homeless man who was promised money if he rolled around in shit, but never given the money.
"LMAO, that lavianna's head looks like my friend...who is also named lavianna!"
Doctor: "Alright, lets have a look --holy shit, this is serious. This lavianna on your ass has grown to huge sizes! Surgery is necessary immediately!"