The act of soaking a rubberband in lousiana hot sauce, then while hittin it from the back, stretch aforementioned rubberband as far as you can and take aim at your unsuspecting partners pooper. Let 'er rip and try to hold on!
The lousina purchase is when you hot glue coins to your dong and stick it in a girl's anal hole. All this is after you light her hair on fire. There is also another version called the screaming louisiana purchase when the same thing is done except you throw her out of a window when your done.
Dude, I pulled a lousiana purchase last night and now the cops are after me. Shit gotta go.