Shaq -- I Finally Got My Monster Chopper ... And It's Siiiiick!!!!

It's been a year in the making, but Shaquille O'Neal finally got his massive custom bike from the guys at Orange County Choppers ... and judging by the pics, it was definitely worth the wait.

Shaq first placed his order with Paul Teutul Sr.'s shop back in January -- asking for his ride to be taller and longer than normal to accommodate his arthritic hips.

Now, we've learned the shop came through in a huge way -- delivering the 14-footer (most bikes are 10-feet long) to Shaq earlier this month -- and The Diesel LOOOVED IT.

The bike is insane -- chromed out ... with a Superman logo right on the handlebars