Related Clues:

• Yell from one waving his arms
• "Psst!" (2 words)
• 'Psst!' follower, maybe
• "Yoo-hoo!" while waving (2 words)
• Words said with a wave
• Pick up in conversation what GIs were in WW2
• 'Psst! Hey you!'
• Reportedly eavesdrop in this direction
• Arm-waver's shout with "Hey" (2 words)
• Arm waver's cry