Bitch-kneed is when a straight male voluntarily or forcefully sits, walks, or stumbled while having his knees together like a female. Scared, or feminine like.
Remember when Brad fought Chris and he had him bitch-kneed?

Why are you sitting with your legs crossed dude? you're bitch-kneed right now!

I'm scared right now, it's got me bitch-kneed.
by R. Downing and D. Layton February 25, 2015
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