Three bullets to the hip ain't gonna keep YG from partying his ass off ... even though he's on crutches, and his shooter is still on the loose.
Sources close to YG tell TMZ, just 3 days after he was shot ... the young gangster hit up a Hollywood Hills rager at famous party spot, the PingTank mansion.
We broke the story -- YG was shot 3 times, and refused to cooperate with police working the case. We're told he was plenty social inside the party though.
YG's not-so hidden message to the shooter -- I'm number one?