I was always fond of “golly” Philadelphia Story, after Mike kisses Tracy
As far as wordless dialogue, Kiera Knightley has a pretty awesome scene in Love, Actually as she watches the video tapes.
If non-word ‘grunts’ are allowed, then surely this iconic roar has to be included.
(Safe for Work link)
“Manuel! Manuel!” and “Boo-hoo!”
Candy Goes to Hollywood
“…Chapstick.”
-The Mothman Prophecies
The word in that scene is one of the coolest in cinema;
Gesundheit.
You’re right, of course. Hey, how about this one: “Pity.” (Bzzzzzzzzzzzzzzzt!)
Well since I’ve seen a few other posts with lines from TV, I nominate:
“Phrasing!”
I know that alot of people here on The Dope are movie gurus and such and know all these awesome quotes just by one word or so, but not all of us are … that being said, can we please put title of the movie the “one word phrase” is from? If I want to look up the scene to see the clip in question, it would really help to know what movie it is from.
Thanks!
“Disappointed!” A Fish Called Wanda
For Dante:
Specifically, when the Mayor presents the Key to the City “To our new …”
“Chickenwire?” Blue Lou Martini, The Blues Brothers
What makes the “single-word quotes” fun to me is that they don’t make any sense as a quote out of context, and it leaves others scratching their heads. What makes them memorable is when and how they are said. My two examples were:
You also have Naddafinga and Fra-gee-lay.
You’ll like this:
Years back, I was unloading our moving truck with some guys from my wife’s new job. I handed a thin box to the fellow at the roll-up door; it had pictures in it and I had scribbled the magic word (and it wasn’t “please”) on the front in HUGE letters as there was glass inside. The dude turned around, held the box up high and called to the others.
Nine guys, at once, hollered “Fra-gee-lay.” 
It was 6:30 in the morning. 
Cue the soundtrack!!!" A BUMP BUMP BUMP!!!"
The Quiet Man…Michaleen Oge Flynn sees the collapsed bed in the bedroom… “Impetuous”.
Nicole Kidman’s line (the final one) at the end of Kubrick’s Eyes Wide Shut
[spoiler]
In case you haven’t seen it:
“Fuck”
…for once, not said as an exclamation, but meant literally.[/spoiler]
“Jesus!” Mel Brooks’ character, from History of the World.
“Yes?” Jesus’ reply.
Can we stretch this to tweets?
“Sad!” – Donald Trump
Only one I can think of that might apply is from Serenity