Mump

[Sarah]

(v) Mump, Mumped, Mumping, Mumper, Mumpee.
To mump someone is to hump that persons mum.
This word first surfaced in Paisley, Scotland during a conversation while watching saw III. A joke was made about a child filming his mother in her bedroom from the closet in order to put the video on his private website.
The perpetrator of the act of mumping is known as a mumper while the person whos mother is being humped is known as the mumpee.