Those lips are red, just like red lies

from G-Dragon (Ft. Sky Ferreira) – Black (Sky Ferreira - English Version) Lyrics on Rap Genius

Meaning

She has red lips just like the way the lies he believed are red.
Red lie as defined by Urban Dictionary is “A statement told with complete awareness that the other person knows the statement to be false. This type of lie is often told and accepted to avoid the fallout that might occur from dealing with reality.”

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