Mr. Cheeky
From the Super Mario Wiki
A Mr. Cheeky is a gorilla species found in Sneezemore Cave of Wario: Master of Disguise. They are apes, made to appear old, as they are seen wearing dentures. They try to hurt Wario by passing wind on him.
[edit] In-game Description
This poor ape is old enough to need dentures, and yet still doesn't have the hang of the whole potty-training thing. Hence the undies and angry demeanor.

