A combination of spacker / spastic and mong, mostly used by school teachers who would be sacked for using any of the former words, but by using an apparently made up word are able to describe their pupils accurately and with glee.
"Fuck me, my new year 10 class are fucking spongy, most of them can't stop dribbling."
"What you mean you don't understand, what are you, a fucking spong?"
"What you mean you don't understand, what are you, a fucking spong?"
by Dildo Daggins22 September 16, 2007
 Get the spongmug.
Get the spongmug. by S7NR December 29, 2020
 Get the Spongedmug.
Get the Spongedmug. Random Sponge: Guys hurry up and run this way!
Davis Jose:You're a Sponge get out of our lobby, you always flank left.
Davis Jose:You're a Sponge get out of our lobby, you always flank left.
by lDuskz January 6, 2013
 Get the Spongemug.
Get the Spongemug. by illegalien November 20, 2006
 Get the spongedmug.
Get the spongedmug. by LankyGuy12345 May 13, 2016
 Get the to spongemug.
Get the to spongemug. by The Colonel July 18, 2003
 Get the spongemug.
Get the spongemug. A person who has no desires for anyone of the same or opposite gender.  Asexual.  Reproduces with themselves.
Girl 1:  I flirted with Thomas all night but he didn't seem to do anything!  What the hell?
Girl 2: Don't worry, he is just a sponge.
Girl 2: Don't worry, he is just a sponge.
by Rorshock April 13, 2009
 Get the Spongemug.
Get the Spongemug.