Oh man. These are a ****in quandary, let me tell you. Everyone uses them differently. To me:
1) acting wild and messing around, usually used somewhat sarcastically/making light of self
2) ????? Can be kind of an “idek, shrug”/“meh”, or messing with someone/sticking out tongue at someone, or lightly playful like turned-down version of 1, or emotionally tired (like turned-down version of cross-eyes with tongue sticking out. Not dead but starting to get there), or very lightly annoyed
3) joking yuck, or sort of joking embarrassment, or sometimes messing with someone
4) I have no idea. This emoji fills me with dread. Who does that? Who makes that expression? Who stares straight at someone with wide eyes, mouth in a large open grin, and flops their tongue out of mouth like a dead fish? Why? Is this a threat?