Related Clues:

• Flirtatious signal
• [Get the joke?]
• Instant
• Split second
• Blink of an eye
• Flirtatious gesture
• Secret sign
• [Just kidding!]
• Secret signal
• Flirt's signal
• Subtle come-on
• Sleep unit?
• Sly signal
• Playful signal
• It's quick, supposedly