watermelon
suika
JMdict 1380890
すいかwatermelon買(か)った?bought
Did you buy a watermelon?
A bare casual question marked only by rising tone. The object (すいか (watermelon)) sits in front with its を (object) particle dropped, and the verb 買う(かう) (buy) shifts to plain past 買った(かった) (bought).