Weak Knees 

You and your partner engage in intense rough sexual intercourse stood up (preferably over a kitchen table) once the woman begins to climax her legs will shake, tap the back of her legs to make her fall over, can be used as an embaressment technique

Mark: I got gertrude back by giving her the weak knees

Weak Knees by CHGC May 1, 2009

knees weak arms are heavy 

Moms spaghetti

yo ted what you want? Knees weak arms are heavy

knees weak arms are heavy by SpaceManZim November 6, 2017

Weak in the knees 

Being weak in the knees means whenever you see something attractive or after you have sex and/or cum your legs feel weak

Hey do you see that hot girl over there?!

Yeah look at her fat ass

Man she’s got me weak in the knees

Weak in the knees by Billybobjr69 November 6, 2018

weak in the knees 

What one says/feels after they had amazing sex and/or a splendid fap session, the feeling is so intense you can barely stand up, thus weak in the knees.

Guy "Dude, you all right? your legs are wobbling"

Dude "Yeah I'm all right, I just received the best blow job from my gf; made me weak in knees "

"Damn, I jizzed so hard last night my legs couldn't support me for the next 3 minutes."

"Damn, I banged my gf so hard last night I thought my knee caps would explode"

weak in the knees

weak in the knees by SirCumsALot April 13, 2013

Weak kneed whore 

A man or woman that talks bad about someone behind their back and acts like they like the person they talk bad about to their face and uses personal hurtful comments or insults to bother the person in front of whoever they were talking bad about the person to.

Watch him switch up, he is just another weak kneed whore.

Weak kneed whore by Itz_Ghøst January 26, 2023

Weakaknees 

weak·a·knees
n. pl.

A language composed of words, phrases or sentences that make you weak at the knees.

Have you been to "www.WEAKaKNEES.com", its a new website where people can blog and tell their stories of what made them weak-at-the-knees.

Weakaknees by GOODnGOOFY September 6, 2010