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A way to tell someone you'd like to have sex with a woman so much, you'd rip her in half just to get to the good part.
I saw her in the hallway and said, 'I'd knock the back out of that!'
He texted his friend, 'That waitress at the diner? I'd knock the back out of that!'
At the gym, he yelled, 'I'd knock the back out of that!' to a woman lifting weights.