Just to be sure, I checked. “A double negative is the nonstandard usage of two negatives used in the same sentence so that they cancel each other and create a positive. In Shakespeare's day, double negatives were considered emphatic, but today, they are considered grammar mistakes.”
Lists of negative words - no, not, nobody, nothing, none, never, hardly, scarcely, barely, only - and practice worksheets for avoiding double negatives can be found on several websites.
Just because "Can't Hardly Wait" was the name of a 1998 movie and a popular song does not justify its acceptability. There are other examples of poor grammar being spoken more frequently. What comes to your mind?