For anyone wondering, this is basically a young millennial / gen z meme. The emoji is usually pronounced "pwease", as in a childlike pronunciation of "please" Therefore the command is basically just asking very nicely, hoping to get one's way edit. source: dude just trust me
Alternatively, a good chunk of my twitter feed would call this the bottom emoji, without attempting to give it a pronunciation. I don't think any particular pronunciation has consensus, but various groups of people imbue it different meanings.
But I bet if you said "pwease emoji" or "bottom emoji", much of the same group would probably get it.
Though maybe "pwease" would this and the fingers.