The phrase "extra dash" means to do something more or go beyond what is normally expected or required. It implies putting in additional effort or going the extra mile to achieve a better result. Full definition
The art and photography collection injects extra dashes of originality into this home. (livingetc.com)
i want extra dash charger for mobile charge in office. (gogi.in)
In China's high - pollution environments, Cortana will inform you of the air quality just as it would traffic and weather conditions, while the UK version of the software will employ extra dashes of irony and sarcasm to even everyday exchanges. (cnet.com)