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2.
the act of a male hot gluing pennies onto his penis, then proceeding to ram a girl in the ass. While doing so, the male then sets her hair on fire, throws her out a the window of a four story building, severely injuring her, then steeling her tv.
Jake: "i gave this chick a Louisiana purchase the other day. My dick still hurts but the tv was worth it."

Jack: "Very nice!"
by jdubs9486 March 03, 2010
 
3.
A girl is giving head to a guy, but a third party is moving her head up and down.
Did you hear that David gave John's mom a Louisiana Purchase?
by Tracy's Cherrie November 21, 2010