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Short for Diarrhea. It starts with a D, ends in the bathroom, and is never heard in polite conversation.
Sorry Professor, but I've been stricken with Silent D. Unless you can move that engine into the bathroom, I don't think I can run those tests you wanted today.

silent swan 

See Silent Duck - Swan defferenciated by long reach of arm during activity 'like a swans neck in length'
Wow thats going deep, like a swans neck, thats a right silent swan!
silent swan by Dr Quacker July 5, 2010

Silent Cusser 

When a man-child whispers his cuss words because his mother will get very angry if she hears him cussing in a normal tone of voice.
You guys are (whispers) faggots.And everyone says what, not knowing what he said at the end.(Hence the term Silent Cusser).
Silent Cusser by Daniel Mircheff August 14, 2011

silent bomb 

a fart that's silent but deadly
i just let off a silent bomb.

BROOOOO you smell rotten
silent bomb by melloz January 17, 2017

silent foxes

Silent foxes is a command a teacher or administrator might give to their students, in which the children hold up their hands to look like foxes.
Señorita Hashillo said to her obnoxiously loud class, “Silent foxes!” In which all of the students quieted down and held up their foxes.

Silent Fire 

When you need to pee but you see something so arousing that you get hard and forget about using the toilet before beating your meat. The sensation you get during post nut clarity ends up being unbelievably painful, as if a fire was dwelling in your penis. It takes a long time to disappear and only gets worse depending what you pleasured yourself to.
Josh: " Dude, last night I had to pee so hard, but I saw a hot lewd of Astolfo and totally forgot he's a dude and that i had to pee. I tryed falling asleep with a silent fire in my pants and strong depression."
Jerry: "Wtf? I just asked for a little money."