to flirt, to show romantic interest
Cara, aquela garota está dando bola pra você, vá falar com ela!
Dude, that girl is totally flirting with you, go talk to her!
The expression dar bola ("to give the ball") is one of many everyday Brazilian phrases that came out of football. Passing the ball to a teammate means trusting them and bringing them into the play, and from that gesture the words took on the sense of paying attention to someone.
Source: Canal Brasileirices.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.