Having one's anus forcefully, repeatedly and not-always-voluntarily resized. Size 9ing is most often performed courtesy of one's new cellmate's johnson, although at some parties, a proper piss-on / pass-out may elicit the act.
Guy 1: "Why is Shiela walking all funny?"
Guy 2: "She got Size 9'ed after passing out face down on the couch at Bob's party."
Guy 2: "She got Size 9'ed after passing out face down on the couch at Bob's party."
by The Evil Steve August 05, 2005
by Jack the Douche April 04, 2019
Girl: I'm Pretty Plus Size
by PrettyPlusSize October 18, 2011
by Flip April 26, 2004
by latasha ferosh April 23, 2008
by i drive the bus October 29, 2004
by uncle t-bag June 13, 2007