Horny Peek-a-boo

A game often played at a bar between two people who are interested in each other. The game goes like this: person A gives person B a sultry look. Person B evades person A's gaze out of shyness, but then person B decides to reciprocate to person A. Person A repeats person B's first action. Repeat until either approach each other or one party retreats.

Friend: "I saw you were playing horny peek-a-boo with that baddie last night!"
Person A: "Yeah I was too shy though, so I retreated like a beta."