A lot of cats be frontin'
Mad singles wit' a fifty on top

from Big L – Size 'Em Up Lyrics on Rap Genius

Meaning

Alot of dudes are carrying a knot $1 bills with a single $50 on the outside to make it look like they have a lot of cash in their pocket.

To help improve the meaning of these lyrics, visit “Size 'Em Up” by Big L Lyrics and leave a comment on the lyrics box