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1.
SUPER STUPID DUMB ASSHOLE. Someone who constantly gets on your nerves and talks alot of shit and nothing worthwhile comes out. They talk so much shit their brain is constipated.

stinks musty funky foul ingorant shittalker funkbunk
My neighbor is such an ssda I had to call the City to ticket them because of their stench. I need a breathing machine when I try and converse with them.

intelligent bright unforgettable pleasant smelling orbitz clean
by toiletmouth September 04, 2010
 
2.
Acronym for "same shit, different asshole" as coined by the Austrian death metal band Pungent Stench on 2004's Ampeauty album
Sarah: WTF is wrong with people? Everyone I've been running into lately has been nothing but rude and inconsiderate!

Steve: I hear you! Another case of SSDA, I guess. People suck!
by Hacked Up For BBQ August 18, 2014