Carelessly; any way that is not the best or preferred method. Typically used in negative constructions to convey that a specific method should be used. You can't just clean this room any old how—Mom will find any speck of dust you leave behind.
any old how
in no particular order.
ˈany old how
(spoken) in a careless or untidy way: You can’t just dress any old how for such an important occasion.