Definitions by Mushroom Koen, bassmastah P

hammerfisting 

In sex with multiple partner, 'hammerfisting' refers to the act of inserting ones fist into the vaginal- or anal orofice of a sex partner, whilst another sex partner repeatedly pounds the elbow of the inserted arm to create a hammer-effect.

the heat of the moment required hammerfisting to occur

hammerfisting by Mushroom Koen, bassmastah P November 24, 2011