sex

A related word to almost every other word defined on Urban Dictionary.

Man: Sex?

Woman: No.

love

Indescribable.

Love is too good for words.

hmm

The universal interjection of a true philosophical and political thinker.

Guy 1: So what's your take on Obama's health care plan?
Guy 2: Hmm...

(five minutes later)

Guy 2: ...so this guy's like, the President, right?