Congress 'whacked' the budget by 1.5 billion dollars. = Congress 'whacked' 1.5 billion dollars from the budget.
Their priorities are (all) 'out of whack'. [=they do not understand what things are actually important]
I paid 'top whack' [=('US') 'top dollar'] for these items. [=I paid the highest amount possible]
(..) See to her. Bronze! Gonna get you! It's all right. No one's gonna hurt you. It's all right. This one's whacked out of his skull. Whacked right out of his skull, man! He ain't never coming back. It's all right. I'm gonna let this go now. I know you're a frightened girl... (..)1979 Mad Max
(..) Hell! She glued the damn cabinets shut again! "Again"? You've got somebody who comes in regularly to glue your cabinets? You've met some of the whack jobs I've gone out with... It's not that big a stretch. Oh... Oh... So, this is my fault? Who let her in? You're a deeply disturbed man, (..)2006 TvShow: Two and a Half Men Title: Most Chicks Won't Eat Veal: Original Pilot Season: 1 Episode 0
(..) He wants his money. Okay, okay. This is your money. Amahl, tell this guy to calm the fuck down. That guy's whacked. Your money. Hey, big man! Whoa, whoa, whoa. Hey, hey! Jambo. You know the jambo, yeah? (..)2016 13 Hours