To get ones fist covered in fecal matter from rapidly pumping ones fist into an anal cavity other another person.
"Man Matt the rangers sure are chocolate fist blasting the Canadians right now"
by Cinnamonring May 18, 2014
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Rapid and forceful, yet consensual, fisting in the anus.
1. Sarah's ass hurt after a long night of fist-a-blasting

2. Tommy gently drifted off to sleep, lulled by the far off sound of wind and fist-a-blasting from next door.
by Dick nuts February 16, 2014
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when three girls get so utterly fucked up and keep blacking out, that the fist come out to play. the fist(s) hulk smash the vaginal vaginal cavity until your intestines are all jumbled up.
1. taydum’s cat hurt after a long night of fist blasting

2. kurty gently drifted off from blacking out, then was awoken by a double fist blasting from brooke
by the three some red man group September 9, 2022
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