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1.
Combination of sweet and yeah. Used to express how ridiculously amazing something was.
Ivan: "Dude, did you see that kill number four got during the volleyball game?!"

Ray: "Sweeya!!!"
av phatpenguin16 28 april 2010
 
2.
to agree to something sweet, cool, dope, legit, tight, etc...
"Hey Ivan, do you like the new whip?!"

"Sweeya bro!"
av sweeyaa6 28 april 2010