A man who penetrates other men/women rapidly with his fist.
"Hey look, there's the legendary Mr. Fister. How was last night?"
by datindianguy10 November 24, 2016
Get the Mr. Fister mug.
Mr. Sister Fister is a middle aged man who puts his finger his sister’s vagina
That man looks like/is a Mr. Sister Fister
by Hepatitis A January 29, 2018
Get the Mr. Sister Fister mug.