People who take something that does not belong to them.
Nabbers are usually seen as bad because they are not following the rules.
Examples:
The police caught the nabbers who stole the candy.
The nabbers took my toy when I wasn't looking.
I don't want to play with the nabbers because they always take my things.
The nabbers thought they could take the cookies without anyone noticing.
The nabbers are always taking things that don't belong to them.
The nabbers are not nice because they take things that are not theirs.