It means that your penis is so long that it drops to your knee.
A: You know, I don't wanna brag but mine drops to the knee.
B: Woah! That's so damn huge. I don't think I can take it.
What I call homo-sapiens who are addicted to perianal abscesses.
Person 1: Are you addicted to perianal abscesses?
Person 2: Yes.
Person 1: Parts Around Left Knee Insane Abscesses (Palkia): The First Juvenile Release.
I see you’re bored. You are so bored that you even look for meaningless phrases.
Tim: I’m bored. I’ll search “ I'm not holding on to you. I've got my entire knee.“.
Robert: What?
when you're you get so nervous you feel like you're knees are gonna fall off like an apple on an apple treeeeeeee
"hey, are you nervous?"
"no..."
"yes, you are"
"okay fine. how'd you know?"
" because you have apple knees"