whats this expression?

[Allison Wonderland]

i cant remember how it goes:

hold on to your _____, kids

or something like that
hold on to you what?
is it lunch or seatbelt. they dont sound right

 

[CIA Agent]

hold on to your hats kids!

 

[Ryan]

hats its "hold on to your hats, kids" altough people have changed it a lot