A sexual practice involving insertion of the hand. Also refers to making or using a fist in general contexts.
From 'fist' plus the gerund suffix '-ing.' 'Fist' comes from Old English fȳst, related to Proto-Germanic *fūstiz meaning 'closed hand.'
The clinical linguistic analysis of this term demonstrates how English forms gerunds systematically - any verb can become a continuous action or practice simply by adding '-ing,' regardless of the activity's nature.
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