A decider is someone who makes decisions on issues using a lack of judgment and intelligence. Typically a decider has a propensity of sticking his head up his ass. He usually lets even more idiotic people make the actual decisions for him.

Apparently, The Decider is George W. Bush.

A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.

defensive posturing catch phrase that lets POTUS43 pick and choose: 1. which laws to follow, 2. which citizens to spy on, 3. which constitutional rights to uphold, 4. which millionaires to cut taxes for, 5. how long to let oil companies price gouge consumers, 6. how many vacations are appropriate for the POTUS, 7. who gets to run his illegal wars, 8. how many children get left behind, 9. what God's will is, 10. who is working undercover on Iran's nucular program, and who is political fodder

1.) A person in a leadership role, usually of limited intelligence and lacking keen self-awareness, who stubbornly insists on making all the decisions that often end in abject failure with dire consequences for others.

2.) George W. Bush's description for himself, at a White House press briefing on April 19, 2006. Bush told reporters, "I’m the decider, and I decide what’s best. And what’s best is for Don Rumsfeld to remain as the secretary of defense.”

A churlish and irresponsible individual, when responding to any and all criticism with all the moral and logical authority of a 4-year-old; might also express some elements of claivoyance.

A person who decides what is best.