return the flavor 

To reciprocate the giving of an item or action of a "sweet", "dope", etc or enjoyable quality (flavor).

Thanks for that sick cd, I'll return the flavor when I see you in a couple weeks.

Man, thanks for letting me in on that dank. But don't worry, I'll return the flavor soon enough.

return the flavor by Little Bhask November 2, 2009

return the favor 

When one person in a couple provides oral sex (or any other sexual favor) for the other repeatedly, and wants the other person to do the same to him/her.

Kate: "I always give you oral sex, why don't you return the favor?"
John: "Okay, I will"

return the favor by yyts2 September 10, 2009

return the favor 

sending nudes

"Hey, could you for the love of God, return the favor?"

return the favor by OmniBreaker November 16, 2018