Said to mean Really, Totally, Completely, a lot, very much so or to add emphasis to something.
Also said as an acknowledgement meaning O.K or I agree/concur. Said 'fulllllllleeeeee bro' in the west of Sydney or anywhere 'West' in Australia.
1. "I am fully sick of this shit!"
"You should fully quit."
"Fully Sick Bro!"
2. "I can't believe Jack is in LongBay!"
"Yeah, fully."