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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
by Billybobjr69 November 06, 2018
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May 12 Word of the Day
When someone goes to the gym and spends 90% of the time on their phones scrolling through social media
Looks like its thumb day again for Jimmy with his usual routing... 3 sets of 5 snapchat selfies and 10 sets of scrolling through facebook until exhaustion
by Gary br April 02, 2017
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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
by SirCumsALot April 13, 2013
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