A dildo that has some form of adhesive, that literally allows it to be slapped on, over the woman's vagina. The infamous danger being it detaching in a compromising position, such as pegging.
Mary stood up slapped on the Slap On and was ready to peg.
by ThatGodTodd October 22, 2014
Lets all give him a slap on.
by Bensonator_v8 July 12, 2005