I'm not doing a Mateo, but there's a free smiley for the correct guess.

Guess my avatar
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Haven't the foggiest I'm afraid.
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At first glance, I thought it was a coiled snake, but now I think it is a child’s toy, motorcycle with rider. Maybe a Transformer.
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... not to mention that the muscle man form of the nano suit gives him great fantasies about himself!
Bring back the gringoboy avatar?