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1.
The shade of red that one's lips turn from prolonged kissing, dick sucking, or enjoying a nice cherry popsicle.
#1

Person 1: "I wonder what that girl was doing behind that building over there."

Person 2: "Her lips are blowjob red; someone must have been having a good time back there."

#2

"I was eating a popsicle and now my lips are blowjob red!"
by New Cancer July 11, 2012