Tyga doesn't need drugs to get hieroglyphic ... he just dropped $20,000 on an Egyptian-made tomb for his new L.A. store ... and it's pretty rad.
Sources tell us, Tyga spent more than $120,000 decorating the newly-opened Melrose clothing store called Last Kings -- the tomb was just a drop in the bucket.
We're told $100,000 went toward painting the place's ceilings like the Sistine Chapel -- and the remaining money went toward the tomb, as well as a bunch of other Egyptian-made Pharaoh-phernalia ... like the black and gold guard statues ... and sand.
Yes, Tyga actually paid to import sand from Egypt ... and his store is 10 miles from the beach.
At least it looks cool.