It's kind of hard to explain. It’s a neutral word really. But if it had to be positive or negative, it'd be a negative word. You normally use this word when referring to someone:
Who ignores counsel
Who is just plain stupid/stubborn
Who makes unnecessary comments
Who makes mistakes
Does dumb stuff
Does something unbelievably stupid/crazy
Who talks shit
Who can't back it up
Who tries to do something and completely fails
You get it? It's really hard to explain. I just want people to know this word SO exists in the slang/lingo world.
Just know it's not a compliment :P
"Yeah she told me that girl's boyfriend is totally cheating on her and when she asked him about it he denied it."
"Wow....what a scribbler(boyfriend)"
"Hahahah! i just jumped from my roof to my neighbor's roof!"