Never underestimate those who you scar
Cause karma, karma, karma comes back to you hard!
from Lauryn Hill – Lost Ones Lyrics on Rap Genius
Meaning
Warning her ex that whoever he’s hurt in the past (eg. her) will come back and hurt him in the future.

The karma, karma, karma is an allusion to the song Karma Chameleon by Culture Club.
To help improve the meaning of these lyrics, visit "Lost Ones" by Lauryn Hill Lyrics and leave a comment on the lyrics box