Top definition
A made-up rule where people who are 40 years old or older get to use the rule as a response to anything they don’t want to participate in.
Travis: “Hey Tristen, look at this!”

*Tristen looks down at Travis’ hand, and sees that Travis has made the Circle Game sign. *

Tristen: “No man that doesn’t count, The rule of 40 bro”
by The A-Team February 03, 2018
Get the mug
Get a Rule Of 40 mug for your coworker Sarah.