When a man slides his penis between his partner's buttocks cheeks, but does not penetrate.  Similar to "titty-fucking," but instead involving the butt cheeks.
by Laura from Ohio January 27, 2006
 Get the slipdoggingmug.
Get the slipdoggingmug. Slipdog - A person (usually a guy) who always gets the bigger, better deal. Great with the opposite sex.
by mokafu January 18, 2004
 Get the slipdogmug.
Get the slipdogmug.