It's simple.
ALLIGATOR has the same number of letters as ARGENTINA, the country Higuain comes from. Pogba is standing in front of that airboat to indicate he is A FAN of the move.
His pose is to indicate that not only do we now have a ROCK solid defence, we've taken a STEP UP in our efforts to win the Champions League and he wants to stay for EVERglades.
Also note black short and white trainers, along with a blue tank top to represent our away kit.
Add in the sunglasses to keep out the RAY-olas, and the fact he's ready to THROW IN THE TOWEL on a United move and it really couldn't be clearer.