when i was like 14, our family maid had found porn on my younger brothers computer (he was like 12, and totally inept...he actually kept the thumbnails of the porn he liked on his desktop...like no one could see it -.-) anyway, the maid told my mom and step dad about it, and later that night they decided they should check my computer out. of course, as they came in to check my computer, i was knuckle-deep in schlicking myself. needless to say, they found the porn i had...
A form of measurement used to determine the size or width of a vagina or anus, or the act of inserting fingers into said orifices. Preceded by a number which indicates how many knuckles.
---It still has not been determined if fisting someone is considered 4 or 5 knuckles deep, as the debate contiunes if the thumb counts as a knuckle
"So last night I was two knuckles deep in this chick's ass..."