Urban Dictionary defines slizzered. The Daily What explains the rest:
So last night, someone at helm of the American Red Cross’s Twitter feed accidentally (drunkenly? Red Cross says no) tweeted this. It’s since been deleted, natch, but the best part? It resulted in a veritable flood of blood donations. Dogfish Head Brewery made a meme out of the hashtag #gettngslizzerd, asking people to donate. And donate they did: “After I drop off a pint of blood to the @RedCross, I’m replacing it with a pint of @dogfishbeer #gettngslizzerd,” tweeted @ereed812.
God bless America.