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1.
An expression used when things are shitty to the extent that the situtation is analogous to the displeasure a heterosexual male would feel if he were to suckle upon the testicles of another man.
"I have to work late tonight, this sucks balls."
by Faulkner August 11, 2006
 
2.
If something just isn't your style.
Or if you don't like something.
"Dude, wanna jam out with Save The Whales Foundation?!"
"No, that fuckin' sucks balls"

"My parents grounded me for last night."
"That sucks balls."
by amand-a-saurus rex August 28, 2008