Rehearse lines to them and then we fuck faces

from The Weeknd – Loft Music Lyrics on Rap Genius

Meaning

He tells all the girls the same meaningless lines and then receives/gives oral sex with them.

“Rehearse lines” may also be a double entendre for doing coke.

“fuck faces” is also a continuation of the Eddie Murphy shit. In the original Eddie Murphy special Delirious, he had an extended joke about fuck faces.

Scarface also likes to “Fuck Faces”:
http://youtu.be/SpabGXYugFE Fuck Faces

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