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3.
1. A seemingly impossible task.

2. Any of various customer-specified coffee or coffee-related drinks whose names are usually as long or longer than this definition.
1. Three final projects in five days? That's one hell of a tall order.

2. "Oh, I'd like a Triple-score Double Half-Diamond Sparkling Choco-caramel Machiatto-Mocha Mixed Shot with Extra Twice-whipped Cream!" What a faggot, trying to sound all high and mighty with his gay-ass drink.
by Imeyo Ueshei Tweyouthey June 29, 2009
 
1.
an assignment or task which is difficult or seems impossible to accomplish.
completing that paper and submitting it on time proved to be a tall order, since I only had less than a week to do it...that's the last time I leave anything until the last minute!
by Polo May 01, 2007
 
2.
a difficult task, or assignment
Getting people to accept a compromise in a polarized forum like that before the vacation is a tall order.
by The Return of Light Joker December 26, 2011