an uncle smudgey is when a person fingers there asshole to get shit on their fingers then you rub it in a poor innocent bitches face therefore you uncle smudgeyd someone
"hey i im gonna uncle smudgey kyle watch this"
kyle gets smudgeyed
"hahah kyle you dipshit u have a little thing on ur face"
"fuck you guys i shit my pants enough"
The crustybrown material that gets transferred to the rear of the toilet seat or underwear, resulting from the accumulation of fecal matter at the top of an unclean, too-far-rear-wiping person's ass crack.
I almost sat in the hefty buttsmudge that you left on the seat!