Cause I'm tall as Shaq

from Tech N9ne (Ft. Serj Tankian) – Straight Out the Gate Lyrics on Rap Genius

Meaning

Former basketball player and rapper, Shaquille O'Neal is 7'1" — enormous.
Although Tech is only 5'8", he thinks himself to be as tall as Shaq (7'1") metaphorically due to his prestigious name and artistic talents. He isn’t saying he is literally tall, he is saying that his image is large.

This isn’t Tech’s first comparison of himself to Shaq (see here).

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