stick (your tongue) out
Definition: to extend your tongue so that it is visible. Used, especially by children, to show disapproval or dislike.
E.g.1: Miss? Billy just stuck his tongue out at me!
E.g.2: Billy, I’ve told you not to stick your tongue out – it’s very rude!
This phrasal verb can be separated. (E.g. 1 & 2)