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When doing a girl doggie-style, instead of having both knees on the ground, bringing one knee up, leaving the other on the ground.
This modification of a classic move allows for deeper penetration and more leverage.
"What happened with that date last night?"
"Totally dropped the knee on her, she came buckets."

"Yo, Josh! Remember to drop the knee when you're with your girl."
by The Phillip Jenkins December 06, 2008