Literally, “are you aware?”. From ligado in the slang sense of "attentive".
tá ligado?
- (Brazil, slang) you know? (rhetorical question to confirm agreement or understanding at the end of a statement)
Eu gosto muito daqui, tá ligado?- I like here a lot, you know?
- Used other than figuratively or idiomatically: see tá, ligado.