Knee cap slap

This is where you slap your friend's knee very hard to the point they almost get a bruise.

Billy:Don't make me Knee cap slap you Jimmy! I won't hesitate!
Jimmy: go away Billy before I smack ya
Billy: Omae wa mou shindieru

Jimmy: nani?!
Billy:*KNEE CAP SLAP*

i'm on my knees

when someone really wants something from you.
or
when someone is preparing to give you head

i'm on my knees man, pleease.
or
i'm on my knees~

As hard as a goat's knee

Something so hard/tough, like a lump of stale bread or an oul' scone, you can't hardly bite it.

Jayz lads, thon bun's as hard as a goat's knee!

Knee deep In cum

Cumming so hard

When your sister walks in your room “I’m knee deep in cum”

Dis-knee to the groin

When one feels subjected to too many Disney movies

Although John loved his daughter, watching Lion King 47 times felt like a dis-knee to the groin

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bad knee day

Similar to a bad hair day, but instead of having nasty looking hair, the victim has nasty looking knees. May result in dryness, stubble from shaving, rashes and/or birthmarks.

Most often used by women.

Wow, look at all that stubble. I'm sure having a bad knee day today!

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Deep Knee Bends

The act of squatting over a fire hydrant repeadily down to a 90 degree angle (or further) until satisfied

"Last time I saw you're mama she was doin deep knee bends over fire hydrants. I was like yeeahhh, get down on that fire hydrant Bitch!!!"

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