Stinkin' stu is a standard enemy found in the sewers and in caves. they send a scent of stinch that is said to be able to kill a fully-grown goomba if it had a nose. they only appear in super DUPER mario bros. they can be playable if you put in the code "STINKY97" at the secret code screen. 
Stinkin' stu

stinkin' stu in his cameo concept art.

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