Skid Row's Sebastian Bach -- No Wasted Time ... Rings Up New GF (VIDEO)

Ex-Skid Row front man Sebastian Bach is still way into rock ... this weekend he put a huge one on new fiancée Suzanne Le's finger.

TMZ caught Bach and his new smoke show leaving Madeo in West Hollywood just moments after he popped the question ... and to say he was beaming hardly does it justice.

Bach and the former Hawaiian Tropic model have only been together since October -- but he still anted up for the ice. How much did he drop? We asked ... and you'll love his response.

The other must-see moment -- Bach comparing his 41-year-old fiancée to a piece of meat.

He's a keeper ... check it out.