From the Super Mario Wiki
Oinker is a souvenir in WarioWare: Twisted! located in the Instruments folder. It features a pink pig's nose (a fake one, according to the souvenir's description) attached to a small tube, which has drawings of pig noses on it. By tilting the console to one side, the pig nose slides on the tube to that side and plays an oinking sound. The pitch of the sound depends on how gradually or how quickly the console is tilted. If the console is continuously tilted, the sound increases in pitch until it hits a limit, signified by the pig nose growing larger in size and glowing red.