Like a thick smoke (such as is emitted by a smudge pot).(adjective)
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Use "smudgy" in a sentence
"The screen can get kind of smudgy after it has been pressed against your face but that's why they've given you headphones with a mic."
"Allan kind of smudgy & out of focus because its real old."
"When I was a beginner in portrait-painting, I remember that, after I had succeeded in making my background stay back where it belonged, my figure sometimes had a way of clinging to it in a kind of smudgy weakness, as if it were afraid to come out like a man and stand the inspection of my eye."