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1.To prevent two women from having intercourse with each other
2. The lesbian version of a "cock block"
Kelly and Sandra were about to have sex with each other, but Sandra's little brother finger blocked them when he woke up

Amy: "Yesterday, Crystal and I were getting intimate at the party, when Jamie, her ex-girlfriend, spilled her drink on me."

Lexi: "That's terrible. How rude of her to finger block you two."
by DeathByASpoon June 06, 2010
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