The noise generated by a fat person when walking. This event is characterized by the rubbing of material due to the pressure being applied underneath it by the excess fat. Thighriction can also occur with skin on skin contact but the noise level is less noticeable. The common resulting side-effect of thighriction is worn pants in the crotch area, and in instances of skin to skin contact, a painful rash. The decibel level of thighriction is also dependent on the material being placed under these stressful conditions, with denim being one of the most audible.
You can always tell when Jenny is coming around the corner, as her thighriction precedes her.