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Sex position between two males popularized by older men, possibly from the Olympia, Washington area. Generally taking place in parking lots behind bars, man #1 faces retaining wall, building wall, etc. while man #2 enters him anally. Reach around optional.
Dude when I came out of the bar last night there were 4 sets of guys Oly Wallbangin' in the parking lot!
by Hahnnotsolo June 02, 2010
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