When someone does something stupid, dumb or retarded.

Dur, or dúr, is an Irish word used to describe a person who is incredibly stupid, slow or boring.
It can also be used to describe an action.

duh.

1. When someone's first name or sirname is exhibited to the public in a display of hatred and revenge;

moron, idiot. keep middle, index, pinky, finger and thumb to forehead with palm facing away. origned in mamaroneck

A nickname for a BF, given to him by his GF who thinks that he is sometimes dumb.

also could be given because he is cute in a way of being dur.

A saying used to mock someone who had just stated the obvious, or made an idiotic remark. Can be used sarcastically