Idiot expression used by those with low intellectual capacity. An alternative to asking "What are you doing". Not to be confused with WHATTAYADOIN or WHAT THE HELL ARE YOU DOING?!?!
by Steven Muntner *see RAT-MAN March 7, 2005
Get the what u doinmug. by that.Kid.Who.Likes.Girls July 12, 2020
Get the what r u doin step brendinimug.