Jamal Anderson -- Former NFL Running Back Fumbles His Tax Return

Former NFL star Jamal Anderson is best known as the originator of the "Dirty Bird" touchdown dance -- but Uncle Sam is unimpressed ... and just wants a fat check for the back taxes it says Jamal owes.

According to a tax lien filed by the Georgia Department of Revenue, the former Atlanta Falcons star owes money for the 2007 fiscal year. Anderson's debt is piling up too -- a $52,234.28 principal has nearly doubled to $102,797.06 ... thanks to interest, penalties and fees.

Calls to Jamal's rep were not returned.