she was laid out on the bed and i was knuckledeep in her vagina when her sister walked in
"pertaining to a situation when you are hot and heavy with a significant other and your fingers are "knuckledeep" in their anal or vaginal opening"
"she was laid out on the bed and i was knuckledeep in her vagina when her sister walked in" What is the definition of "knuckledeep"?