A person so dumb they can't tell the diffrence of a penis or finger and think the knuckle on a finger is the end of the dick head.
That bitch was so gross I couldn't get hard. So I fucked her with my finger and told her I have a small dick. She said the end of my head was big she is so dumb what a fuck knuckle
Someone who is beating off, fucking their own hand fuck knuckle
Hey fuck knuckle stop beating off
When said person is being annoying or is being a headass
Person 1: “God, Michael is being such a fuck knuckle”
Person 2: “You can say that again”
Someone who is a complete and utter idiot.
1. Don't be such a fuck knuckle.
2. That fuck knuckle crossed the highway without looking.
3. If you're going to be a fuck knuckle, you can piss off.
Look up Donald Trump on Google if you are unfamiliar. (Absolute retarded fuckwit cockhead).
Louis, a mild-mannered demure guy, had just started dating horny, hung Dave. Louis wanted to "take things slow" and not fornicate right away. This gave Dave frustrated blue balls. One day after work they were heading upstairs and Dave grabbed Louis and went to the bathroom, where he pulled Louis' hand around and together they jerked Dave off leaving Driveby Knuckle Children all over the bathroom.
Kitty Knuckles is when you and a friend are so excited about something you put your knuckles together and wiggle your fingers.
Omg girl great job! "kitty knuckles"