Have a six flags day 

As an employee pretty much it means go f*ck yourself.

Guest: “Why can’t I bring my phone on this ride, this is f*cking stupid, go f*ck yourself.”
Six Flags Employee: “Have a six flags day”

Have a six flags day by Jose0213 June 3, 2018

Have A Six Flags Day 

A day at a Six Flags location where the employees continuously tell you to "Have a Six Flags Day" when you wait in line or get on a ride,its meaning is unknown

Six Flags Employee:Have a Six Flags Day!
Random Park goer:What the hell does that mean?

Have A Six Flags Day by Quikshotz1 April 10, 2010