blueberry muffin

In certain cultures, especially in military tours to Afghanistan, asking for a 'blueberry muffin' at a massage parlor means to get a hand job at the end in exchange for a big tip.

person 1: I got a massage today at FOB Shank massage parlor.
person 2: Did you get a Blueberry muffin at the end?
person 1: Yeah, it cost me an extra $20.

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