knee-high 

Similar to "back in the day". Usage signifies that you have known said person for a long time; technically since you were little kids who were only as tall as the lower leg of an adult. Your height was "knee high".

Aaron: Hey man, that kid Sam is a real chiller. How do you know him?
Ben: He's been my boy for a while. I know that kid from knee-high

knee-high by marshy boy December 7, 2006

knee high 

noun. 1. When lying down under a blanket, a hard on that resembles a knee.

Random Girl: "Jamie, move your knee. I can't see the television."
Jamie: "That's not my knee. That's a knee high!"

knee high by Cindy February 14, 2006

knee high to a grasshopper

being very young or back when you where just a kid. possibly intending that someone is short.

"back when i was knee high to a grasshopper, we where never careful."
"your about knee high to a grasshopper arent you?"

knee high to a grasshopper by The Rye Guy April 23, 2008

knee high to a duck 

referring to when somebody was younger or even when he or she was a child.

"I've known Charlie since I was knee high to a duck."

knee high to a duck by CharmBoy0211851 December 4, 2009

knee high to a dick 

the same as a walking blowjob

You're knee high to my dick, bitch.

knee high to a dick by Felix April 21, 2003

Knee-high on a grasshopper

Where I’m from, there’re two types of folk those who ain’t,
And those who are knee-high on a grasshopper. Which type ain’t you ain’t?

Where I’m from, there’re two types of folk those who ain’t,
And those who are knee-high on a grasshopper. Which type ain’t you ain’t?

Knee-high on a grasshopper by Chief financial officer David October 27, 2019

knee high converse 

An abomination of all that is good and beautiful in the world. Under no circumstances buy the things.

"I bought some knee high converses today. What are you doing with that knife? No stop STOP HELP"

knee high converse by Cheesepuff98 April 24, 2014