Use 'I'll say!' to show strong agreement with a friend's opinion in casual conversations.

Informal Agreement

'I'll say!' often communicates that you feel strongly or enthusiastically about what's been said.

Emotional Emphasis

'I'll say!' can emphasize that a statement someone made is undeniably true.

When reacting to surprising news, 'I’ll say!' helps express your astonishment.

'I'll say!' is an old-fashioned way to show that something is a big deal or very impressive.

Use 'I'll say!' to indicate the intensity of your reaction, especially when you're impressed.