Face like a roofer's knee 

Used to describe a person who may not generally be considered among the very beautiful.

"Ooh she's nice..."
"What you talking about, she's got a face like a roofer's knee!"

Face like a roofer's knee by TeamBPR July 13, 2009

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

i got a arrow to the knee

how to say I got married in the old times

I was an adventure like you until I got a arrow to the knee

i got a arrow to the knee by skyrim March 17, 2015

That's a kneeslapper 

A phrase coined by a particular person who does theatre is lebanese and is super smart

THAT'S A KNEESLAPPER FOR SURE FOR SURE
*slaps knees wildly with a crazed look in her eyes*

That's a kneeslapper by avamarie-is-super-pretty October 11, 2022