It's Not Cricket!

Like Have a Heart!, please don't take this idiom literally. Most things in life...are...not...cricket.

Fact.

Meaning
Basically, it means 'it's not fair'. (I know, I've whined about things not being fair before myself)

Use in Normal Speech
When whining that something isn't fair.

"Oy. Stop gloating and telling me not to gloat. That's not cricket."