1. Dirty, grimy, or in a filthy condition; unpleasant or disgusting in appearance.
Usage: informal; chiefly British
2. Of poor quality; shabby or in bad condition.
Usage: informal; chiefly British

Examples

• The bathroom was absolutely mankiest after the party.
• That old car is the mankiest thing I've ever seen on the road.
• He came back from camping covered in the mankiest mud imaginable.
• The kitchen floor was mankiest before we cleaned it.
• That's the mankiest pair of shoes I've ever laid eyes on.