Rick Ross Sued Over 'Maybach Music' Tagline

Rick Ross' entire "Maybach Music" marketing strategy is a rip-off, jacked from a 2007 track with a similar name ... so says a rapper in a new suit.

We broke the story ... Ishaq R. Muhammad -- aka Young Muhammad -- threatened to sue Da Boss back in September 2017, claiming Rick stole the catchphrase -- frequently dropped on his songs -- from Muhammad's 2007 jam, "Caprice Music."

According to new legal docs ... YM says he featured Rick on his "Caprice Music" single and Ross could be heard saying the phrase all over the track. Muhammad claims that's where Ross got the idea for "Maybach Music" ... and he's been using it ever since.

Muhammad's officially taking Rick to small claims court now, and wants $9,999 for theft of his intellectual property. He's also suing Roc Nation for endorsing "Maybach Music."