I heard you good with them soft lips
Yeah, you know word of mouth

from Rihanna (Ft. Drake) – What's My Name? Lyrics on Rap Genius

Meaning

Silly Drake pun: he’s heard “word” of her “mouth”

To help improve the meaning of these lyrics, visit “What's My Name?” by Rihanna (Ft. Drake) Lyrics and leave a comment on the lyrics box