5301991f_and_The_Art_of_Breaking_Things__detailed_explanation
[signal] Tongue poke [part of body] mouth / tongue [possible meaning(s)] disapproval, rejection [detailed explanation] 
The tongue extends briefly and slightly at the centre of the mouth as if tasting something nasty. The gesture may be extremely subtle. An extreme version may be accompanied by a wrinkling of the nose, and a squint of the eyes.
“I pretty much try to stay in a constant state of confusion just because of the expression it leaves on my face.” – Johnny Depp | Zen and The Art of Breaking Things
detailed explanation