If you have your hands in your pockets and your thumbs are sticking out, you feel really good about yourself. In fact, in a group of people, you may feel the superior one of all present. Thumbs signal your attitude that says superiority, dominance, assertiveness. So if you are feeling “cool” you are probably feeling superior!
Men will often use exposed thumbs when they are around women they are attracted to because this is evolutionary nature. He wants her to see him as the best choice for a mate in order to maintain the species. Bet you never thought of that before but it is true!
At work, if you are the boss, watch when you expose your thumbs. If you are a staffer, better keep the thumbs under cover!