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When a male or female lubes their shins and presses them together to be fucked.
Yo, did you hear Katie is into shin-fucking
Shin-fuck by Sl1m Thiccc August 21, 2018

Shin fuck 

When you are having sex then your shins Touch
Shin fuck by Molly monkey November 23, 2019

Shity Run Fun 

Thats when your stomach is bubblin and and yo booty is drippy,sticky,gooie.

To take a shot of chum straight to tha ass

Made up by the Late Great
Mac muthafuckin Dre! Thizz In Peace
"Tell that girl wassup with shityrunfun!"

fucked up shiy 

damn i meant to spell fucked up shit, not fucked up shiy
fucked up shiy by squints1234 January 29, 2018

fuck shine 

A term refering to the female genitalia after you have serviced it properly from behind. After 2-3 hours, it should have lost its lubricity, becoming "shiney." A name to call a buddy who reminds you of a "well serviced vagina."
Boy, that fuck shine is a royal bag of douche!
fuck shine by JT. Johnson July 26, 2006