(v.)
to immerse one's hand in a bucket of ice or frigid material, and shove such substances into another's rectum. Often used as a masochistic prerequisite to anal sex, the ice typically numbs the anus of the recipient.
"...yeah, she asked me to arctic fist her. At first I was thinking, what the fuck? But apparently it numbs her asshole, and it feels amazing."
to shove your hand into a bucket of ice water, grab a fist full of ice and then shove into the others rectum
"man my ass is leaking water from the arctic fist I got last night"