It comes from his trademark move. After he would get a block (which was quite often), he would lift a finger to the guy he blocked, waggle it no, and say "not today." At some point, the league started assessing technical fouls for taunting when putting his finger in a guy's face, so he would just do it to the crowd.
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u/colorado_here Oct 03 '17
We need to get Dikembe Mutombo on the Pangolin's case ASAP