When a female has a extra supremely hairy crotch and a guy has sex with her ignoring the fact, but then the guys dick gets tangled in the pubic hair. That is the fuckbuckle.
Her: we got into a fuckbuckle
Or
Her: girl last night I warned him that we might get fuckbucled but he said he could take it......
typically the second knuckle of your ring finger after finger fucking a womans tightpuss with your pointer and middle fingers only; results from getting poo from her rectum hole on it
Celeste is great. First she slobbed my knob and gobbled the baby gravy then she licked my rusty fucknuckle clean of her week old ass mayo/ fudge stank combo. AND, I posted it on Youtube for all to see.