The act of taking one or more epic dumps. Usually, this term is used when you're making multiple trips to the throne for various reasons like, taking a laxative, getting bubble guts from eating White Castle, or doing a purge or a cleanse.
I was constipated after taking some antibiotics, so I took some milk of magnesia and I was deucing it up for like 9 straight hours. I filled that cup to the brim and shot it down like bourbon.
Bob: Man, look at Jim over there!
Mark: I know, he's totally douching it up!
Bob: Let us proceed to beat him an inch from life for such unacceptable behavior.
Mark: Indeed.
doing any or all of the following:
-being lame
-buying pointless materials such as dvd's like seinfeld or buying brass knuckles.
-laughing like a creep
-being loyal to your friends and then going beyond that
-having no sense of direction when driving
-driving horribly when angry about something
-believing almost anything your friends tell you
-buying lunch for your friends occasionally or when they don't have money
-going to circuit city and out to lunch 3-4 times a week
-being obsessed with batman to the point where you want to bone him
-if you watch shows like gilmore girls and smallville
"why did you just buy that dvd if you thoughtthe movie was ok, you're totally douging-it-up"
"we're starting to hang out too much, stop douging-it-up"