And as for the drug use, well I can't vouch for that

from The Lonely Island (Ft. Natalie Portman) – Natalie's Rap Lyrics on Rap Genius

Meaning

Many rappers will exaggerate to try and seem harder than they actually are. While Samberg doesn’t accuse Natalie of lying, it does throw her previous boasts into doubt.

To help improve the meaning of these lyrics, visit "Natalie's Rap" by The Lonely Island (Ft. Natalie Portman) Lyrics and leave a comment on the lyrics box