I am the deadliest rapper, you claiming that you flow like water
But really y'all niggas Evian backwards

from Jean Grae (Ft. Pharoahe Monch & Royce Da 5'9") – Assassins Lyrics on Rap Genius

Meaning

Using a device favored by his long-time pal Eminem, Royce points out that the popular water’s brand name spelled backwards is “naive”. As it turns out, the backwards spelling was unintentional (the spring that provided the company’s water is in the town of Evian-les-Baines) and not, as is often rumored, a sly dig at consumers silly enough to buy water in a bottle

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