To overly admire another individual. Usually sarcastic, it is used to notify and embarrass the 'sluper' who is highly regarding or adoring the other person. Can be used if one person is good friends with another person too.
Chris: I really like Mike. He's a good kid.
Jay: Yo, stop slurping Mike, guy.
Jay: You spend a lot of time with Mike. All you two do is slurp each other.
Chris: I really like her.
Jay: You're sluprin' this chick. Stop being a faggot.