I think it's Foreman's expression of the Yen Yang symbol like the joker's helmet in the movie full metal jacket (the peace sign and "born to kill"). But that doesn't bother me at all.

What bother pisses me off though is, he's using his "rabbi" excuse. One of the commentator said the reason Foreman's KO percentage is so low because his religion forbid him to seriously hurt someone.

I think that's bull!