When you get a 👆 in a text, it usually means one of a few things:
1) The person is literally pointing something out to you that's above your message, like a photo or link you should check out. It's a way to direct your attention.
2) They're emphasizing a point they just made, like "That's 👆 what I'm talking about!" Basically calling extra attention to their previous statement.
3) It can also be a playful way to call out or poke fun at something you said, with a bit of a teasing vibe. Like "Oh, so you think you're 👆 hot stuff, huh?"
The context and who's sending it makes a big difference. From a romantic interest, it could have a flirty undertone. From a friend, it's more casual. But overall, 👆 is about highlighting something, whether literally or figuratively.