You should've save the welcome mat

from Jet Age Of Tomorrow (Ft. Tyler The Creator) – Good Knight (The Knight Hawk) Lyrics on Rap Genius

Meaning

Tyler is saying it should read “bitch I’m cumming in” on the welcome mat.

Could be referring to his bonus song from the Goblin album Boppin Bitch

http://rapgenius.com/193887/Tyler-the-creator-boppin-bitch/I-used-the-welcome-mat-as-a-cum-rag

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