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1.
Someone who is prone to untimely and sometimes painfull shit pains, from which this person cannot restrain his or her bowels and is forced to soil themselves. Sometimes more than once. This can result in total embarrassment by the subjects parents especially if he or she goes home and needs a towel to enter the house and the parent refuses to get said towel without explanation.
His brother Chris, is the infamous Mr Poopy Pants of south jersey.
Por j burg 12 de febrero de 2008
 
2.
A grumpy male with such a poor attitude, it would lead you to believe that he might just have a pile of poop sitting in his pants.
Babies are always grumpier when they have poop in their diapers... Thus a Mr. Poopy Pants
Por Tet 05 de septiembre de 2013
 
3.
the ultimate urban word definer.
mr poopy pants must be a wordilogical god.if you dont know what it means he will.
Por mr poopy pants 02 de noviembre de 2007