When you wear a large headband around your waist and her neck as she is giving you oral. The elastic band acts as a rubber band effect, so when she pulls back it forces her back down. Possibly causing her to deep throat.
"So what did you do last night?"
"oh, my girlfriend and I were Head-Banding. She told me she has a sore throat today"
"Sounds like a good time"
Head-Banding