A person that chews their food obnoxiously loud...to the point of sounding like a cow chewing grass.
"Dude...your such a plapper...close your mouth!"
"Bro...you sound like a cow..stop plapping!"
An extremely loud fart that occurs when your ass cheeks flap in the gust. Mainly occuring while seated on a chair.
Yo man, I just plappered big time