Ain't my first rodeo

Meaning

A way of saying you are experienced in a particular situation and cannot be fooled or surprised. You have been through this exact scenario before.

Confident, street-smart

Used in a sentence

• You do not need to explain how to file these forms because this ain't my first rodeo.
• The salesman tried to overcharge me, but I told him this ain't my first rodeo.
• Relax, I know how to pack a suitcase for a week, this ain't my first rodeo.