When something (or someone- for that matter) is done to absolute perfection.

This term is derived from a guy named Potter. The best in the world at dominating things/people.
"See that girl over there? last night i took her home, and dominated her, potter style"

or

"dude, you ate that burger in like 30 seconds" "yeah, i went potter stlye on that thing"
by tslice4321 January 22, 2009
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A sex position whereby the partners are forced to do it doggy-style because they're doing it under a staircase.
Dude, we went to the movies, and then we totally did it Harry Potter Style in the parking garage stairwell afterwards
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