When in some period of your childhood you mess up/make yourself look like the biggest retard/Goof up past the point of return and you remember it when you are older.
"oh yeah bro remember when you and i dressed as actionman to the dress up day?"
"yeah dude that was a major child goof right there yo"
"yeah dude that was a major child goof right there yo"
by calculator man May 11, 2014
Get the Child Goofmug.