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When someone ejaculates on your fist, and you begin to fist them with it.
Clayton ejaculated on Ivonya's hand;then she began to fiston herself
Fiston by Pappy bless November 30, 2016
A person who finishes everything he starts
Im going to fiston the shit out of this anime
Fiston by Jametheloookt172727 November 22, 2021
Fiston is very funny chill outgoing competitive the angry guy gym freak and is just that nigga
yo have you heard fiston is just that nigga now
Fiston by anonymous November 23, 2021