Hand guestures?

So I was leaving work and a male coworker leaves at the same time as everyone else. We go the same way for a distance than I make a left and he goes straight. The road we are on is a 4 lane with stoplights. I we both gotten stopped by 2 stoplights each time our cars ended up side by side. I can kinda tell he was trying grab my attention out of the corner of my eye so looked over and he was making the I’m watching you gesture with his hands. What’s your opinion on why he was doing this what do you think it means. Possibly.
Hand guestures?
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