Not the UFC, but my opponent is tapping
In UFC, to be tapped out also means to be knocked out. In this line right here there are multiple meanings, in the context of a battle with lyrics (or a rap battle, possibly):
-The opponent of The Genius is tapping their head because they can’t think of anything to say from being overwhelmed by the lyrical prowess of The Genius
-The effect of the opponent’s lyrics are “tapping” him (like a gentle blow) metaphorically, meaning they are just small blows that do not affect him that much.
-Or, simply The Genius is just about to defeat his opponent
To help improve the meaning of these lyrics, visit "7 Pounds" by GZA Lyrics and leave a comment on the lyrics box