Get the coffin and start making flower arrangements ... 'cause Shaq's son says Damian Lillard's rap career was just murdered by the NBA legend in their battle this month!!
"My dad bodied Dame Lillard," Myles O'Neal tells TMZ Sports ... "That's all I need to say. It's over, he won."
If ya missed it ... Shaq and Lillard have been at each other's necks the last couple weeks -- each releasing TWO rap tracks with a bunch of disses aimed at each other.
It all started after Dame went on "The Joe Budden Podcast" and questioned the NBA legend's rap skills .