Straw-fucking

It's when you put one straw's tip inside another straw's tip and try to spit alcohol (or whatever else) back and forth to blow it into the other person's mouth.

Person 1: Hey give me your face. Let's put our straws together. Because this is so fun and cute.
Person 2: Uh.. what? uh.. okay?
Person 3: Are you guys....really... straw-fucking? BYE.