What does tongue applauded when he wipe them on his shirt mean?

The pressure is on.

Explanation:

This line is considered a synedoche in poetry which is a figure of speech in which a part of something represents the whole. This line is from "Casey at the Bat" and in this saying it means he has 5,000 fans watching him and cheering, which is 10,000 eyeballs. The 'tongues' are referring to the fans.