Irish bodybuilder Blessing Awodibu posted a video of his grappling match with Super Sage ... which went down in September during Northcutt's trip to Shanghai.

Blessing looked good from the jump, but Sage got the best of the big man as the match went on.

Awodibu was a great sport -- saying the ring-work was "fun as f**k" and even calling Sage "a gentle giant."

Nothing about that looked gentle.