Related Clues:

• Surreptitious attention-getter
• Call to attention?
• Long-distance call?
• Subdued attention-getter
• ... a cheater in class
• Word of protest
• Discreet attention-getter
• Sound that may turn heads
• Subtler alternative to ''Yo!''
• Word repeated by Fat Albert
• It may precede the sharing of a secret
• Subtle "Yo!"
• "Hey!"
• ''Hey, pal, over here!''
• "Stop right there!"