A person who pretends to be wise or knowledgeable.

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.

Someone who makes smart aleck, sarcastic comments, often at inappropriate times and usually at someone else's expense.

Someone always making feeble wisecracks, who laughs at his/her own jokes and is generally deserving of severe and painful punishment.

Someone who thinks they are smarter than everyone else. Similar to know-it-all.

Someone who thinks he or she is smarter than everyone else.

a wise ass, generally a nebbish male trying to get over with a humorous, but usually feeble attempt to make someone else the butt of the joke. Wisenhemiers are usually called out and decsribed as such.