winker
n.— «She says, “Cindee, will you wax my butt?” I flipped her over on her hands and knees and slapped her winker with wax and—yank, yank—she was clean as a whistle.» —“Down-there hair care” by Roshan McArthur in L.A. Sunday Mirror (U.K.) June 1, 2003. (source: Double-Tongued Dictionary)