A smaller-than-usual candy bar that usually comes in bags of 20 or so.  Usually bought for distribution over Halloween.
by Amelia Q November 14, 2004
 Get the Fun Sizemug.
Get the Fun Sizemug. by owo bitch April 30, 2019
 Get the fun sizedmug.
Get the fun sizedmug. by Zegeroth October 10, 2007
 Get the fun sizemug.
Get the fun sizemug. another word for a short person
emily(a short person): hey whats up??  
michael(tall person): nothin much. guess what?
emily: what?
michael: your fun sized!
michael(tall person): nothin much. guess what?
emily: what?
michael: your fun sized!
by Mr. Zdawg May 3, 2008
 Get the fun sizedmug.
Get the fun sizedmug. The best way to describe your cock if it's below average and you must divulge the information in an honest way. A favorite with fun sized girls.
by Baird024 October 16, 2016
 Get the fun sizemug.
Get the fun sizemug. by funsizeguy December 12, 2010
 Get the fun sizemug.
Get the fun sizemug. by heyhiwhat May 12, 2010
 Get the fun sizemug.
Get the fun sizemug.