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This is just a stupid joke on a "comeback" seventh graders used to say (you know, in response to: "Why don't you SUCK my DICK?" And then the other person would say, "No thanks . . . [what I put in the story]").
It's one of those quasi-homophobic comments particular to that time, when no-one has any experience and alternates between nervousness and feigned overconfidence.
Maybe it's different for girls (ha ha!).
Funny thing is, though: obviously, this "comeback" implicates both parties as being homo-fond folks, so maybe junior high kids are more "open-minded" than they are often represented to be.
Or: maybe they're just STUPID! (I, for one, would NOT want to go back to the seventh-grader I once was!)