2. To be in a real predicament and/or a lot of trouble, especially with a higher authority.
Jerry: Great goin' dumbass, I told you to fill up the tank when we had the chance.
Stan: I know, I know...now we're fucked sideways.
2. Dude, when your mom finds out that you maxed out her credit card you're gonna be fucked sideways.
(2)Drinking way too much to the point where one can't walk straight.