kneecle
A condition often affecting "thiccer" people where their knee, when fully bent (so the heel is nearly touching the buttocks), is still "squishy" to the touch. People with out kneecles can feel the hard bone when touching their knee in this position. Squishiness levels can range from car tire to Jell-O.
Wow, her legs are so thicc she's got some phat kneecle, but I kinda like it ;)