1: The act of taking a shit, literrally, a number 2.

2: The act of taking a shit so large, two flushes were needed.
Man, my bathroom always smells after you drop a duece!

"Toilet almost got clogged..."
"You drop a duece?"
"Yah, I shoulda flushed twice but I didnt."
by Dragonbreathp9d August 14, 2006
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This is when you take a monster shit and in fact so monstrous that your asshole was stretched out more than it's ever been and you are in serious pain for at least two hours after and you see blood streaks on the toilet paper after you have wiped
Damn man after dinner last night my guts were hurting and I had to drop a double duece. I had to stand the rest of the night cuz my asshole hurt so bad I couldnt sit down.
by Bananzalone April 20, 2018
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