What is the dirty /sexual meaning of this emoji?

[Anonymous]

So a guy sent this raised fist emoji to me once and when I asked him what he meant by that he said it's an adult emoji and not for kids. I have no clue what it means though

[Anonymous]

he wants to fist you.. gross

[truthbeknown]

Fisting.

[DanoM1]

Wank. ✊🏼💦