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Back my fist 

The jamaican term for masturbating.

Comes from the action made when doing so (the back and forth action of your fist)
*watching some porn*
"i think i jus goin go back my fist now"

"Dawg, mi a go home and back mi fist"
"YUTE! You need a girl!"
Back my fist by BobbySox June 19, 2009

back him fist

to masturbate, play with yu self
mi catch the boy john a back him fist
back him fist by rude_boy505 July 30, 2009

wanna back that up with a fist 

sumthing u say to a douche who is talkin shit and cant back it up, a.k.a 7-2
gay wanna back that up with a fist ill stab u wench ahhh im sorry

backfist 

when one strikes another up the ass with their singular fist
imma backfist that bitch
backfist by skinnyPenis1369 June 19, 2018

BackFist 

A Jamaican word that refers to the act of Masturbation
"Fada yuh cah stop BAckFIst?"
BackFist by Clockers February 14, 2024
Yo dawg, she sen mi har pum-pum pic and mi did haffi backfist
Backfist by Sillybob27 February 2, 2026