1. To steal someone's knives is to engage in sexual activity with someone else. It is a synonym to "fuck" or "tap."
2. To take someone's virginity; to pop one's cherry.
this term originiated at urban high school in san francisco, california and has spread throughout the bay.
1. I stole Madeleine's knives again last night.
2. Adrienne must have been drunk last night, she got her knives stolen by Marc.
3. I walked in on that slut stealing knives from that ugly freshman.