True.
Johnny Thunders Rocks and L.A.M.F. is one of his great records. However, L.A.M.F. is not punk graffiti but gang graffiti. In New York City (johnny's home) the gang members would stray into other gangs territories where they would tag D.
T.K. meaning "Down to Kill", a challenge to the gang who's
turf it was. L.A.M.F. or "Like a Mutherfucker" would be added to accentuate or validate the existing tag.