im still convinced its him refering to his critics who have called him a "headless chicken"
i think it is just a weird celebration with no hidden meaning. like when you end up with an in-joke amongst friends that arose just from being silly.
it's good because it is low effort and original... not to mention the intrigue he's managed to throw up around it.
I reckon its something his kid did once that made him laugh, thus he made it into a celebration!
I think its an 'inverted FACEPALM' aimed at the menatlly challenged Albion fans, who questionned his ability - specifically Tom '1 in 10 Glenn' Hark Preston Park...
In which case, maybe instead he should paint the outside of his hand red and make a fist in front of his nose, for that full trademark Scottish tramp "giss' 10p son"-meets WC Fields turps-nudger styling?