Term used when a male perpetrates having a well-endowed penis, when in fact, to his partner's surprise is actually the opposite of large.  In this case, see peter petweeter.
by geniusH August 6, 2006
 Get the perpin' the slongmug.
Get the perpin' the slongmug. by Mr Fo April 29, 2008
 Get the slong coastermug.
Get the slong coastermug. by jo ho witness July 31, 2006
 Get the dong slongmug.
Get the dong slongmug. by cptsnowblow March 6, 2018
 Get the slong monstermug.
Get the slong monstermug. by Slurped buttface October 1, 2023
 Get the slong lickermug.
Get the slong lickermug. 
